Using this clue I removed 2 files out of ~/.configsystemmonitorrc and systemsettingsrc.
Then rebooted and logged in. This time no issues seen in logs and I was not kicked out.
I am struggling with the same problem on a gnome desktop. Wayland does not work.
Under Gnome (at least on my system) these files are not existant.
Can you or anybody else advise on how to reset the displaysettings on Gnome?
Thank you in advance.