X server crashes when system is busy but server is idle

[Jonathan Ryshpan]

A number of times lately my system has partially locked up.  When this
happens, the system is playing an audio file (usually using rhythmbox)
but is otherwise idle.  Audio continues but the screen is inactive: generally it is dark
but sometimes it shows a screen saver (sometimes a clock that never changes); sometimes
the cursor follows the mouse; usually no cursor is visible.  It's possible to get into
console mode by pressing CTRL/ALT/F2 but I haven't been able to get the graphical
system back without rebooting.   I first saw this under Fedora-31 and have been waiting
for Fedora-32 before reporting it.  Nothing in the log stands out.

Any theories?  Anything I should look for?

System is Fedora-31 and Fedora-32
Server is:  /usr/libexec/Xorg
CPU model is: Intel(R) Core(TM) i5-4460  CPU @ 3.20GHz
Graphics controller is:  Intel Corporation Xeon E3-1200 v3/4th Gen Core
Processor Integrated Graphics Controller (rev 06)