I am posting here with the hope to get help to solve the problems I have with my wifi connection on my Intel NUC with the Wireless AC 7620 on Ubuntu 15.04.
I have copied below the output of the Wireless Info Script, but before some short history and description about the problems I have.
I built my NUC about a year ago and installed Ubuntu 14.04 straight after for a media center use. Everything was working perfect, with fast and stable wifi connection. When Ubuntu 14.10 was released, I didn't upgrade (I wanted to stay on a LTS version) but kept doing the regular updates.
Then one day to another (somewhere around October / November 2014 I would say), everything went wrong: connection to the wifi was lost on a regular basis, sometimes every few minutes, transfer rate was dropping so low it would take several minutes to display the Google homepage, the connection would get lost and never come back.
I went through several forums/websites/wikis and tried many things. What got the best results I think was to disable the power management with iwconfig. Disabling/renabling the wifi and/or network was working also sometimes. Upgrading to newer Ubuntu version was sometimes improving the situation, sometimes not.
Today, I went back home and wanted to use my NUC again and the situation is worse as ever. Here are the symptoms :
- The NUC quickly connects to my wifi network at startup.
- The signal strength is good, to about 75 % I would say.
- The connection is stable.
- It is impossible to get to any website. If I try to reach the Google homepage for example, the Firefox wheel will turn for ever but nothing shows up.
- Trying to update with apt-get update does trigger some data transfer, but at a very low transfer rate (I cancelled it after five minutes and it wasn't finished).
My router/internet access is a Freebox v5, but I think the problem really comes from the NUC/Ubuntu, as I am also running a Windows 7 desktop and a Debian Jessie nettop on wifi and none of them have these problems.
Thanks in advance for your help !
Any additional command line or test, let me know and I will do it ASAP !
Note: I removed all wifi networks that weren't mine from iwlist scan to stay below the 30000 characters limit.
########## wireless info START ##########
Report from: 22 Jul 2015 21:14 CEST +0200
Booted last: 22 Jul 2015 20:53 CEST +0200
Script from: 14 Jul 2015 17:04 UTC +0000
##### release ###########################
Distributor ID: Ubuntu
Description: Ubuntu 15.04
Release: 15.04
Codename: vivid
##### kernel ############################
Linux 3.19.0-22-generic #22-Ubuntu SMP Tue Jun 16 17:15:15 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Parameters: ro, quiet, splash, vt.handoff=7
##### desktop ###########################
Ubuntu
##### lspci #############################
00:19.0 Ethernet controller [0200]: Intel Corporation Ethernet Connection I218-V [8086:1559] (rev 04)
Subsystem: Intel Corporation Device [8086:2054]
Kernel driver in use: e1000e
02:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b1] (rev 6b)
Subsystem: Intel Corporation Dual Band Wireless-AC 7260 [8086:4170]
Kernel driver in use: iwlwifi
##### lsusb #############################
Bus 003 Device 002: ID 8087:8000 Intel Corp.
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 8087:07dc Intel Corp.
Bus 001 Device 005: ID 046d:c71f Logitech, Inc. diNovo Mini Wireless Keyboard
Bus 001 Device 004: ID 046d:c71e Logitech, Inc.
Bus 001 Device 002: ID 046d:0b07 Logitech, Inc.
Bus 001 Device 006: ID 0d7d:1900 Phison Electronics Corp. USB Thumb Drive
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
##### PCMCIA card info ##################
##### rfkill ############################
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
##### lsmod #############################
iwlmvm 278528 0
mac80211 724992 1 iwlmvm
iwlwifi 196608 1 iwlmvm
cfg80211 540672 3 iwlwifi,mac80211,iwlmvm
snd_soc_rt5640 94208 0
snd_soc_rl6231 16384 1 snd_soc_rt5640
snd_soc_core 196608 1 snd_soc_rt5640
snd_pcm 106496 7 snd_soc_rt5640,snd_soc_core,snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_hda_controller,snd_pcm_dmaengine
##### interfaces ########################
auto lo
iface lo inet loopback
##### ifconfig ##########################
eth0 Link encap:Ethernet HWaddr
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:20 Memory:f7d00000-f7d20000
wlan0 Link encap:Ethernet HWaddr
inet addr:192.168.0.51 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2269 errors:0 dropped:0 overruns:0 frame:0
TX packets:2210 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1637945 (1.6 MB) TX bytes:258557 (258.5 KB)
##### iwconfig ##########################
eth0 no wireless extensions.
lo no wireless extensions.
wlan0 IEEE 802.11abgn ESSID:"TXNPK188"
Mode:Managed Frequency:2.472 GHz Access Point:
Bit Rate=180 Mb/s Tx-Power=22 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:on
Link Quality=61/70 Signal level=-49 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:199 Missed beacon:0
##### route #############################
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.0.254 0.0.0.0 UG 1024 0 0 wlan0
169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 wlan0
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 wlan0
##### resolv.conf #######################
nameserver 127.0.1.1
##### network managers ##################
Installed:
NetworkManager
Running:
root 720 1 0 20:53 ? 00:00:00 /usr/sbin/NetworkManager --no-daemon
##### NetworkManager info ###############
GENERAL.DEVICE: wlan0
GENERAL.TYPE: wifi
GENERAL.VENDOR: Intel Corporation
GENERAL.PRODUCT: Wireless 7260 (Dual Band Wireless-AC 7260)
GENERAL.DRIVER: iwlwifi
GENERAL.DRIVER-VERSION: 3.19.0-22-generic
GENERAL.FIRMWARE-VERSION: 25.17.12.0
GENERAL.HWADDR:
GENERAL.MTU: 1500
GENERAL.STATE: 100 (connected)
GENERAL.REASON: 0 (No reason given)
GENERAL.UDI: /sys/devices/pci0000:00/0000:00:1c.3/0000:02:00.0/net/wlan0
GENERAL.IP-IFACE: wlan0
GENERAL.NM-MANAGED: yes
GENERAL.AUTOCONNECT: yes
GENERAL.FIRMWARE-MISSING: no
GENERAL.CONNECTION: TXNPK188
GENERAL.CON-UUID: 55085fca-cbd0-4126-bdda-1d6e4f39c6bd
GENERAL.CON-PATH: /org/freedesktop/NetworkManager/ActiveConnection/2
CAPABILITIES.CARRIER-DETECT: no
CAPABILITIES.SPEED: 180 Mb/s
CONNECTIONS.AVAILABLE-CONNECTION-PATHS: /org/freedesktop/NetworkManager/Settings/{0}
CONNECTIONS.AVAILABLE-CONNECTIONS[1]: 55085fca-cbd0-4126-bdda-1d6e4f39c6bd | TXNPK188
WIFI-PROPERTIES.WEP: yes
WIFI-PROPERTIES.WPA: yes
WIFI-PROPERTIES.WPA2: yes
WIFI-PROPERTIES.TKIP: yes
WIFI-PROPERTIES.CCMP: yes
WIFI-PROPERTIES.AP: yes
WIFI-PROPERTIES.ADHOC: yes
IP4.ADDRESS[1]: ip = 192.168.0.51/24, gw = 192.168.0.254
IP4.ROUTE[1]: dst = 169.254.0.0/16, nh = 0.0.0.0, mt = 1000
IP4.DNS[1]: 212.27.40.241
IP4.DNS[2]: 212.27.40.240
IP6.ADDRESS[1]: ip = fe80::/64, gw = ::
GENERAL.DEVICE: eth0
GENERAL.TYPE: ethernet
GENERAL.VENDOR: Intel Corporation
GENERAL.PRODUCT: Ethernet Connection I218-V
GENERAL.DRIVER: e1000e
GENERAL.DRIVER-VERSION: 2.3.2-k
GENERAL.FIRMWARE-VERSION: 0.6-4
GENERAL.HWADDR:
GENERAL.MTU: 1500
GENERAL.STATE: 20 (unavailable)
GENERAL.REASON: 2 (Device is now managed)
GENERAL.UDI: /sys/devices/pci0000:00/0000:00:19.0/net/eth0
GENERAL.IP-IFACE:
GENERAL.NM-MANAGED: yes
GENERAL.AUTOCONNECT: yes
GENERAL.FIRMWARE-MISSING: no
GENERAL.CONNECTION: --
GENERAL.CON-UUID: --
GENERAL.CON-PATH: --
CAPABILITIES.CARRIER-DETECT: yes
CAPABILITIES.SPEED: unknown
CONNECTIONS.AVAILABLE-CONNECTION-PATHS:
WIRED-PROPERTIES.CARRIER: off
SSID BSSID MODE CHAN FREQ RATE SIGNAL BARS SECURITY ACTIVE *
FreeWifi_secure Infra 13 2472 MHz 54 Mbit/s 90 ▂▄▆█ WPA1 802.1X no
-- Infra 13 2472 MHz 54 Mbit/s 87 ▂▄▆█ WPA2 no
FreeWifi_secure Infra 8 2447 MHz 54 Mbit/s 52 ▂▄__ WPA2 802.1X no
FreeWifi Infra 13 2472 MHz 54 Mbit/s 89 ▂▄▆█ -- no
FreeWifi Infra 8 2447 MHz 54 Mbit/s 50 ▂▄__ -- no
TXNPK188 Infra 13 2472 MHz 54 Mbit/s 71 ▂▄▆_ WPA1 yes *
##### NetworkManager.state ##############
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true
##### NetworkManager.conf ###############
[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq
[ifupdown]
managed=false
##### NetworkManager profiles ###########
[[/etc/NetworkManager/system-connections/TXNPK188]] (600 root)
[connection] id=TXNPK188 | type=802-11-wireless
[802-11-wireless] ssid=TXNPK188 | mac-address=
[ipv4] method=manual
[ipv6] method=auto
##### iw reg get ########################
Region: Europe/Paris (based on set time zone)
country 00: DFS-UNSET
(2402 - 2472 @ 40), (3, 20), (N/A)
(2457 - 2482 @ 40), (3, 20), (N/A), NO-IR
(2474 - 2494 @ 20), (3, 20), (N/A), NO-OFDM, NO-IR
(5170 - 5250 @ 40), (3, 20), (N/A), NO-IR
(5735 - 5835 @ 40), (3, 20), (N/A), NO-IR
##### iwlist channels ###################
eth0 no frequency information.
lo no frequency information.
wlan0 32 channels in total; available frequencies :
Channel 01 : 2.412 GHz
Channel 02 : 2.417 GHz
Channel 03 : 2.422 GHz
Channel 04 : 2.427 GHz
Channel 05 : 2.432 GHz
Channel 06 : 2.437 GHz
Channel 07 : 2.442 GHz
Channel 08 : 2.447 GHz
Channel 09 : 2.452 GHz
Channel 10 : 2.457 GHz
Channel 11 : 2.462 GHz
Channel 12 : 2.467 GHz
Channel 13 : 2.472 GHz
Channel 36 : 5.18 GHz
Channel 40 : 5.2 GHz
Channel 44 : 5.22 GHz
Channel 48 : 5.24 GHz
Channel 52 : 5.26 GHz
Channel 56 : 5.28 GHz
Channel 60 : 5.3 GHz
Channel 64 : 5.32 GHz
Channel 100 : 5.5 GHz
Channel 104 : 5.52 GHz
Channel 108 : 5.54 GHz
Channel 112 : 5.56 GHz
Channel 116 : 5.58 GHz
Channel 120 : 5.6 GHz
Channel 124 : 5.62 GHz
Channel 128 : 5.64 GHz
Channel 132 : 5.66 GHz
Channel 136 : 5.68 GHz
Channel 140 : 5.7 GHz
Current Frequency:2.472 GHz (Channel 13)
##### iwlist scan #######################
eth0 Interface doesn't support scanning.
lo Interface doesn't support scanning.
Channel occupancy:
5 APs on Frequency:2.412 GHz (Channel 1)
1 APs on Frequency:2.447 GHz (Channel 8)
3 APs on Frequency:2.472 GHz (Channel 13)
wlan0 Scan completed :
Cell 01 - Address:
Channel:13
Frequency:2.472 GHz (Channel 13)
Quality=66/70 Signal level=-44 dBm
Encryption key:on
ESSID:"TXNPK188"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 9 Mb/s
18 Mb/s; 36 Mb/s; 54 Mb/s
Bit Rates:6 Mb/s; 12 Mb/s; 24 Mb/s; 48 Mb/s
Mode:Master
Extra:tsf=00000001ced635cc
Extra: Last beacon: 52ms ago
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : TKIP CCMP
Authentication Suites (1) : PSK
##### module infos ######################
[iwlmvm]
filename: /lib/modules/3.19.0-22-generic/kernel/drivers/net/wireless/iwlwifi/mvm/iwlmvm.ko
license: GPL
author: Copyright(c) 2003- 2014 Intel Corporation
version: in-tree:
description: The new Intel(R) wireless AGN driver for Linux
srcversion: 84DEF0B250352D8D14C9DD1
depends: iwlwifi,mac80211,cfg80211
intree: Y
vermagic: 3.19.0-22-generic SMP mod_unload modversions
signer: Magrathea: Glacier signing key
sig_key: C7:D4:40:34:4C:0B:3A:C2:A3:CE:C2:AE:B9:72:2E:CF:6C:AE:73:91
sig_hashalgo: sha512
parm: init_dbg:set to true to debug an ASSERT in INIT fw (default: false (bool)
parm: power_scheme:power management scheme: 1-active, 2-balanced, 3-low power, default: 2 (int)
[mac80211]
filename: /lib/modules/3.19.0-22-generic/kernel/net/mac80211/mac80211.ko
license: GPL
description: IEEE 802.11 subsystem
srcversion: 88CC41451370601B0D885E4
depends: cfg80211
intree: Y
vermagic: 3.19.0-22-generic SMP mod_unload modversions
signer: Magrathea: Glacier signing key
sig_key: C7:D4:40:34:4C:0B:3A:C2:A3:CE:C2:AE:B9:72:2E:CF:6C:AE:73:91
sig_hashalgo: sha512
parm: minstrel_vht_only:Use only VHT rates when VHT is supported by sta. (bool)
parm: max_nullfunc_tries:Maximum nullfunc tx tries before disconnecting (reason 4). (int)
parm: max_probe_tries:Maximum probe tries before disconnecting (reason 4). (int)
parm: beacon_loss_count:Number of beacon intervals before we decide beacon was lost. (int)
parm: probe_wait_ms:Maximum time(ms) to wait for probe response before disconnecting (reason 4). (int)
parm: ieee80211_default_rc_algo:Default rate control algorithm for mac80211 to use (charp)
[iwlwifi]
filename: /lib/modules/3.19.0-22-generic/kernel/drivers/net/wireless/iwlwifi/iwlwifi.ko
license: GPL
author: Copyright(c) 2003- 2014 Intel Corporation
version: in-tree:
description: Intel(R) Wireless WiFi driver for Linux
firmware: iwlwifi-100-5.ucode
firmware: iwlwifi-1000-5.ucode
firmware: iwlwifi-135-6.ucode
firmware: iwlwifi-105-6.ucode
firmware: iwlwifi-2030-6.ucode
firmware: iwlwifi-2000-6.ucode
firmware: iwlwifi-5150-2.ucode
firmware: iwlwifi-5000-5.ucode
firmware: iwlwifi-6000g2b-6.ucode
firmware: iwlwifi-6000g2a-5.ucode
firmware: iwlwifi-6050-5.ucode
firmware: iwlwifi-6000-4.ucode
firmware: iwlwifi-7265D-10.ucode
firmware: iwlwifi-7265-10.ucode
firmware: iwlwifi-3165-10.ucode
firmware: iwlwifi-3160-10.ucode
firmware: iwlwifi-7260-10.ucode
firmware: iwlwifi-8000-10.ucode
srcversion: 97E94F4448EBBA00BC45455
depends: cfg80211
intree: Y
vermagic: 3.19.0-22-generic SMP mod_unload modversions
signer: Magrathea: Glacier signing key
sig_key: C7:D4:40:34:4C:0B:3A:C2:A3:CE:C2:AE:B9:72:2E:CF:6C:AE:73:91
sig_hashalgo: sha512
parm: swcrypto:using crypto in software (default 0 [hardware]) (int)
parm: 11n_disable:disable 11n functionality, bitmap: 1: full, 2: disable agg TX, 4: disable agg RX, 8 enable agg TX (uint)
parm: amsdu_size_8K:enable 8K amsdu size (default 0) (int)
parm: fw_restart:restart firmware in case of error (default true) (bool)
parm: antenna_coupling:specify antenna coupling in dB (default: 0 dB) (int)
parm: wd_disable:Disable stuck queue watchdog timer 0=system default, 1=disable (default: 1) (int)
parm: nvm_file:NVM file name (charp)
parm: uapsd_disable:disable U-APSD functionality (default: Y) (bool)
parm: bt_coex_active:enable wifi/bt co-exist (default: enable) (bool)
parm: led_mode:0=system default, 1=On(RF On)/Off(RF Off), 2=blinking, 3=Off (default: 0) (int)
parm: power_save:enable WiFi power management (default: disable) (bool)
parm: power_level:default power save level (range from 1 - 5, default: 1) (int)
parm: fw_monitor:firmware monitor - to debug FW (default: false - needs lots of memory) (bool)
[cfg80211]
filename: /lib/modules/3.19.0-22-generic/kernel/net/wireless/cfg80211.ko
description: wireless configuration support
license: GPL
author: Johannes Berg
srcversion: E61EB836E1B33C2A2918485
depends:
intree: Y
vermagic: 3.19.0-22-generic SMP mod_unload modversions
signer: Magrathea: Glacier signing key
sig_key: C7:D4:40:34:4C:0B:3A:C2:A3:CE:C2:AE:B9:72:2E:CF:6C:AE:73:91
sig_hashalgo: sha512
parm: ieee80211_regdom:IEEE 802.11 regulatory domain code (charp)
parm: cfg80211_disable_40mhz_24ghz:Disable 40MHz support in the 2.4GHz band (bool)
##### module parameters #################
[iwlmvm]
init_dbg: N
power_scheme: 2
[mac80211]
beacon_loss_count: 7
ieee80211_default_rc_algo: minstrel_ht
max_nullfunc_tries: 2
max_probe_tries: 5
minstrel_vht_only: Y
probe_wait_ms: 500
[iwlwifi]
11n_disable: 0
amsdu_size_8K: 0
antenna_coupling: 0
bt_coex_active: Y
fw_monitor: N
fw_restart: Y
led_mode: 0
nvm_file: (null)
power_level: 0
power_save: N
swcrypto: 0
uapsd_disable: Y
wd_disable: 1
[cfg80211]
cfg80211_disable_40mhz_24ghz: N
ieee80211_regdom: 00
##### /etc/modules ######################
lp
##### modprobe options ##################
[/etc/modprobe.d/blacklist-ath_pci.conf]
blacklist ath_pci
[/etc/modprobe.d/blacklist.conf]
blacklist evbug
blacklist usbmouse
blacklist usbkbd
blacklist eepro100
blacklist de4x5
blacklist eth1394
blacklist snd_intel8x0m
blacklist snd_aw2
blacklist i2c_i801
blacklist prism54
blacklist bcm43xx
blacklist garmin_gps
blacklist asus_acpi
blacklist snd_pcsp
blacklist pcspkr
blacklist amd76x_edac
[/etc/modprobe.d/blacklist-rare-network.conf]
alias net-pf-3 off
alias net-pf-6 off
alias net-pf-9 off
alias net-pf-11 off
alias net-pf-12 off
alias net-pf-19 off
alias net-pf-21 off
alias net-pf-36 off
[/etc/modprobe.d/iwlwifi.conf]
remove iwlwifi \
(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) \
&& /sbin/modprobe -r mac80211
[/etc/modprobe.d/mlx4.conf]
softdep mlx4_core post: mlx4_en
[/etc/modprobe.d/modesetting.conf]
options cirrus modeset=1
options mgag200 modeset=1
##### rc.local ##########################
exit 0
##### pm-utils ##########################
##### udev rules ########################
[/etc/udev/rules.d/70-persistent-net.rules]
# PCI device 0x8086:0x1559 (e1000e)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
# PCI device 0x8086:0x08b1 (iwlwifi)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"
##### dmesg #############################
[ 3.464732] Bluetooth: hci0: Intel Bluetooth firmware patch completed and activated
[ 3.518660] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'
[ 4.460499] iwlwifi 0000:02:00.0: L1 Enabled - LTR Enabled (repeated 2 times)
[ 7.916726] wlan0: authenticate with
[ 7.920483] wlan0: send auth to (try 1/3)
[ 7.922310] wlan0: authenticated
[ 7.928438] wlan0: associate with (try 1/3)
[ 7.942641] wlan0: RX AssocResp from (capab=0x411 status=0 aid=2)
[ 7.943963] wlan0: associated
[ 359.516348] wlan0: deauthenticating from by local choice (Reason: 3=DEAUTH_LEAVING)
[ 359.531246] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 367.152590] iwlwifi 0000:02:00.0: L1 Enabled - LTR Enabled (repeated 2 times)
[ 370.627806] wlan0: authenticate with
[ 370.631010] wlan0: send auth to (try 1/3)
[ 370.632766] wlan0: authenticated
[ 370.633913] wlan0: associate with (try 1/3)
[ 370.644779] wlan0: RX AssocResp from (capab=0x411 status=0 aid=2)
[ 370.655915] wlan0: associated
[ 495.292650] wlan0: deauthenticating from by local choice (Reason: 3=DEAUTH_LEAVING)
[ 504.186814] iwlwifi 0000:02:00.0: L1 Enabled - LTR Enabled (repeated 2 times)
[ 507.569951] wlan0: authenticate with
[ 507.573064] wlan0: send auth to (try 1/3)
[ 507.575888] wlan0: authenticated
[ 507.576642] wlan0: associate with (try 1/3)
[ 507.585643] wlan0: RX AssocResp from (capab=0x411 status=0 aid=2)
[ 507.586893] wlan0: associated
########## wireless info END ############
I have a NUC as well and found that several minor quirks were fixed when I updated the BIOS to the latest. I urge you to do the same.
Next, check the settings in the router. WPA2-AES is preferred; not any WPA and WPA2 mixed mode and certainly not TKIP. Second, if your router is capable of N speeds, you may have better connectivity with a channel width of 20 MHz in the 2.4 GHz band instead of automatic 20/40 MHz, although it is likely to affect N speeds. I also have better luck with a fixed channel, either 1, 6 or 11, rather than automatic channel selection. Also, be certain the router is not set to use N speeds only; auto B, G and N is preferred. After making these changes, reboot the router.
Next, I recommend that your regulatory domain be set explicitly. Check yours:
sudo iw reg get
If you get 00, that is a one-size-maybe-fits-all setting. Find yours here: http://en.wikipedia.org/wiki/ISO_3166-1_alpha-2 Then, set it permanently:
gksudo gedit /etc/default/crda
Use nano or kate or leafpad if you don't have the text editor gedit. Change the last line to read:
REGDOMAIN=IS
Proofread carefully, save and close the text editor. Of course, substitute your country code if not Iceland.
Reboot the NUC and let us know if stability is improved.
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