I have the same problem it seems. Been really stable for 2 months now but started crashing this weekend, and right now it crashes multiple times a day. The UI still works but is really slow, cpu util is at 100%, can't really get diagnostics because nothing happens. I have attached one of the syslogs with the crash and diagnostics after reboot.
Next I'll try the ryzen tweaks mentioned above.
syslog-1588600124
homeserver-diagnostics-20200502-2106.zip