Problem happened again, this time using Firefox (last time was while using 
FreeCAD).
I waited a minute before rebooting (as each time, so as to be sure the system 
is really frozen).

I have no file under /var/crash, sorry.

** Attachment added: "prevboot.txt"
   
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1912472/+attachment/5457076/+files/prevboot.txt

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https://bugs.launchpad.net/bugs/1912472

Title:
  Display freezes randomly - high CPU usage

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