18.04 - Elan Touchscreen not working

I recently installed Ubuntu 18.04 and can not understand why the touchscreen is not working. Here is the relevant log from xorg.log:

[   359.454] (II) config/udev: Adding input device ELAN Touchscreen (/dev/input/event7)
[   359.454] (**) ELAN Touchscreen: Applying InputClass "libinput touchscreen catchall"
[   359.455] (II) Using input driver 'libinput' for 'ELAN Touchscreen'
[   359.458] (II) systemd-logind: got fd for /dev/input/event7 13:71 fd 27 paused 0
[   359.458] (**) ELAN Touchscreen: always reports core events
[   359.458] (**) Option "Device" "/dev/input/event7"
[   359.458] (**) Option "_source" "server/udev"

[   359.460] (II) event7  - ELAN Touchscreen: is tagged by udev as: Touchscreen
[   359.460] (II) event7  - ELAN Touchscreen: device is a touch device
[   359.460] (II) event7  - ELAN Touchscreen: device removed
[   359.461] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.6/1-1.6:1.0/0003:04F3:0034.0001/input/input8/event7"
[   359.461] (II) XINPUT: Adding extended input device "ELAN Touchscreen" (type: TOUCHSCREEN, id 8)
[   359.461] (**) Option "AccelerationScheme" "none"
[   359.461] (**) ELAN Touchscreen: (accel) selected scheme none/0
[   359.461] (**) ELAN Touchscreen: (accel) acceleration factor: 2.000
[   359.461] (**) ELAN Touchscreen: (accel) acceleration threshold: 4
[   359.463] (II) event7  - ELAN Touchscreen: is tagged by udev as: Touchscreen

[   359.463] (II) event7  - ELAN Touchscreen: device is a touch device
[   359.466] (II) config/udev: Adding input device ELAN Touchscreen (/dev/input/mouse1)

xinput:

⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ SynPS/2 Synaptics TouchPad                id=13   [slave  pointer  (2)]
⎣ Virtual core keyboard                         id=3    [master keyboard (2)]

    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ↳ Power Button                              id=6    [slave  keyboard (3)]
    ↳ Video Bus                                 id=7    [slave  keyboard (3)]
    ↳ Power Button                              id=8    [slave  keyboard (3)]
    ↳ Video Bus                                 id=9    [slave  keyboard (3)]
    ↳ Laptop_Integrated_Webcam_HD: In           id=10   [slave  keyboard (3)]
    ↳ Dell WMI hotkeys                          id=11   [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=12   [slave  keyboard (3)]

dmesg | grep "1-1.6":

[    3.512037] usb 1-1.6: new full-speed USB device number 4 using ehci-pci
[    3.608042] usb 1-1.6: device descriptor read/64, error -32
[    3.839565] usb 1-1.6: device descriptor read/64, error -32
[    4.024035] usb 1-1.6: new full-speed USB device number 5 using ehci-pci
[    4.104032] usb 1-1.6: device descriptor read/64, error -32
[    4.292021] usb 1-1.6: device descriptor read/64, error -32
[    5.312798] usb 1-1.6: new full-speed USB device number 6 using ehci-pci

sudo dmidecode | grep -A 9 "System Information":

System Information
Manufacturer: Dell Inc.
Product Name: Inspiron 5537
Version: A11
Serial Number: #######
UUID: 4C4C4544-0035-5910-8031-B7C04F543032
Wake-up Type: Power Switch

SKU Number: Inspiron 5537
Family: 00

I have tried all steps mentioned in Touchscreen - Ubuntu wiki but could not get it to work. Any pointers?

Something weird happened today, all of the sudden the touchscreen started working and it stopped after a while. Here is the relevant dmesg:

[   86.280036] usb 1-1.6: new full-speed USB device number 10 using ehci-pci
[   86.390483] usb 1-1.6: New USB device found, idVendor=04f3, idProduct=0034

[   86.390487] usb 1-1.6: New USB device strings: Mfr=4, Product=14, SerialNumber=0
[   86.390489] usb 1-1.6: Product: Touchscreen
[   86.390490] usb 1-1.6: Manufacturer: ELAN
[   87.041347] input: ELAN Touchscreen as /devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.6/1-1.6:1.0/0003:04F3:0034.0001/input/input16
[   87.041675] hid-multitouch 0003:04F3:0034.0001: input,hiddev0,hidraw0: USB HID v1.10 Device [ELAN Touchscreen] on usb-0000:00:1d.0-1.6/input0
[   90.337071] rfkill: input handler disabled
[  257.888791] usb 1-1.6: reset full-speed USB device number 10 using ehci-pci
[  330.230527] usb 1-1.6: reset full-speed USB device number 10 using ehci-pci
[  330.310492] usb 1-1.6: device descriptor read/64, error -32
[  330.498404] usb 1-1.6: device descriptor read/64, error -32

[  330.686280] usb 1-1.6: reset full-speed USB device number 10 using ehci-pci
[  330.766239] usb 1-1.6: device descriptor read/64, error -32

uname -a:

Linux dell 4.15.0-45-generic #48-Ubuntu SMP Tue Jan 29 16:28:13 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

lsb_release -a:

LSB Version:    core-9.20170808ubuntu1-noarch:security-9.20170808ubuntu1-noarch
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.1 LTS
Release:    18.04
Codename:   bionic