Comment 49 for bug 1721428

According to last -x command my session terminates only when turning the screen back on.

I also confirm that the session is not only logged out but every process created and all files in /run/shm/ are also killed.

It seemed like installing caffeine (disabling auto suspend and screensaver) had solved it, but after turning the screen on in the morning the session crashed at that moment.
In /var/crash there are files timestamped just after I turned the screen back on of: caffeine, Xwayland and gnome-shell.

This was a fresh install of 17.10 on desktop with AMD cpu and AMD gfx card connected to HDMI monitor. Everything was updated before the latest crash occurred again.

apt-cache policy
 gnome-shell 3.26.2-0ubuntu0.1
 gdm3 3.26.1-3ubuntu3