I don’t have this error on shutdown:
oct. 26 16:28:01 dom0 python3[10706]: The X11 connection broke (error 1). Did the X11 server die?
And I guess that’s the reason for the following errors e.g.:
oct. 26 16:28:01 dom0 systemd[9688]: qubes-app-menu.service: Main process exited, code=exited, status=1/FAILURE
oct. 26 16:28:01 dom0 systemd[9688]: qubes-app-menu.service: Failed with result 'exit-code'.
oct. 26 16:28:01 dom0 systemd[9688]: qubes-app-menu.service: Consumed 13.421s CPU time.
That I don’t have as well.
But I don’t know why Xorg crashed.
Check the Xorg log in /var/log/Xorg.*.