It sounds like gnome-shell was frozen:
ago 10 22:44:55 Pitx-PC systemd[1742]: gnome-shell-x11.service: Killing
process 2047 (gnome-shell) with signal SIGKILL.
But maybe some useful crash also preceded that so please check
/var/crash for any crash files.
** Package changed: xorg (Ubuntu) => nvidia-graphics-drivers-440 (Ubuntu)
** Changed in: nvidia-graphics-drivers-440 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1891086
Title:
Xorg crash Display bug Nvidia
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