Another thing I've noticed is that about the same time the crashes started a glitch in E19 appeared as well. Again random, when I am trying to close a window on the taskbar the mouse would move precisely to the center of the screen and does that constantly until reboot.

On Friday, September 4, 2015 at 6:50:49 PM UTC+3, Frankie Wild wrote:

I believe it's since I installed latest updates two days ago. 

At the time it occurs I get a black screen with a few lines of errors and then back to login screen.

I couldn't memorize what the errors were at the time. I have checked all logs in /var/log to no avail... 

Where could they be, so that I can post more info on the errors ?