Hi Terry,

> I think that it simply ran out of memory after maxing out the CPU
> cores for a minute or two.

I'm surprised a Linux machine is configured to shutdown on persistent
high CPU or memory load.  Rather, the kernel's out-of-memory killer will
kick in and guess a process to kill to free memory.  It sometimes
nobbles the wrong horse.  Perhaps it sent some vital process to the glue
factory which initiated an orderly shutdown, but I doubt it.

Could it be the graphics driver in the kernel which is running amok?
Chromium will be making it work hard by compositing lots of pixel
rectangles.
https://superuser.com/questions/1716854/disabling-gpu-compositing-for-all-chrome-and-electron-instances-on-a-mac

You might find some indication of past problems with ‘sudo -i
journalctl’.  It will place you in less(1).  There's the date to go by
and you can search with ‘/’, e.g. ‘oom-killer’.

-- 
Cheers, Ralph.

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