sorry i know this kind of thing is frustrating to deal with.Big time. I've gotten very good over the years at diagnosing and fixing issues using log messages. But sudden catastrophic crashes like this that don't leave any trace in the logs/journal are *really* hard to pin down.
Did you already consider setting up remote logging? A Raspberry Pi would suffice for that task and you would get any messages that make it out of the system…
Uwe
Thanks, DR
