Well, I promised to get back to this theme after I get my PC up and running again after that strange logging issue.
So I am running Antergos, lightdm, gnome, most likely wayland. Just downloaded the new kernel, but cannot know yet if it affect this behaviour. The recent updates haven’t. It has worked the same all the time after the initial installation.
The PC often stops responding, typically the Chromium browser starts distorting the image, then it stops responding, only the mouse is alive. Sometimes I can quickly switch to virtual terminal and kill the browser process. I might be saved. If I just wait, soon the mouse stops and it is no longer possible to start any virtual terminal.
Another typical way of freezing is when I forget the PC for a couple of hours. It has most often stopped showing the logging screen. And nothing works. As just a moment ago.
What logs do you need?