Ubuntu 18.04 hangs when using Google Chrome, Mozilla Firefox and Thunderbird

System Info:

1. Model Name: Lenovo ThinkPad 11e




2. RAM: 4G




3. Product Page: http://psref.lenovo.com/Detail/ThinkPad_11e?M=20D90020US




4. Graphics and Driver Info:

   
   

   00:02.0 VGA compatible controller [0300]: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Graphics & Display [8086:0f31] (rev 0e)
    Subsystem: Lenovo Atom Processor Z36xxx/Z37xxx Series Graphics & Display [17aa:2224]
    Kernel driver in use: i915
    Kernel modules: i915
   

App versions:

1. Google Chrome: Version 67 in both Ubuntu version(16.04 and 18.04)




2. Mozilla Firefox: Version 60 in both Ubuntu version(16.04 and 18.04)




3. Thunderbird: Version 52 in both Ubuntu version(16.04 and 18.04)

What happens:

1. I usually browse with multiple tabs open and suddenly the mouse and keyboard freeze and and I am forced to restart with the power button. None of the shortcuts work once the system hangs.




2. This happens almost every time I use the system.

Worst to Best:

1. Google Chrome - Hangs with just 3-4 tabs of YouTube open.




2. Thunderbird - Hangs when present with lesser number of tabs (3-4) of Mozilla Firefox.




3. Mozilla Firefox - Hangs with 8+ tabs present with heavy video or image
   presence.

Things I have tried:

1. Re-installation

Current solution:

Got fed-up and downgraded to 16.04.4 which has been stable so far. Have been using 14.04 previously for many years with no issues.