The bug report is https://bugzilla.mozilla.org/show_bug.cgi?id=1891962

There is currently no solution or workaround

I noticed when I deleted the cache and shut down all other applications like Firefox it may not always crash overnight but with other firefox running as well Thunderbird crashes all the time over night normally when the system goes to sleep. I hope that helps.

What are we supposed to do just keep running TB ?