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Sorry to reply to my own message, but I just found this [1] where the recommendation is:

"I managed to fix this by going to the Virtual Machine Settings, clicking Advanced, and then checking the "Pass power status to VM" checkbox."

Haven't tested extensively, but I haven't had a crash in the past day.

Thanks! I will try this and let you know.

I have to quit VMWare Fusion or run the risk of spontaneous reboots while it's asleep.

It does. No crashes if VM is not running.