PC reboots after wakeup from suspend

Every 2-4 days, on average, my computer reboots when I wake it from suspended mode.
During the brief period I ran 19.10 I had the same issue, so I don't expect it to be fixed in the next release.

What log files can I look at/share that could give a clue about what causes this? It's the only problem I have with this installation.

PC: Mac mini (late 2014), i5-4278U, 8GB
OS: Mate 19.04