I've been running Unraid in the same configuration for over 2 years, it's been rock solid. Since I updated to 6.10.x I've experience 2 system crashes where I can't login, neither through web interface or ssh. Most systems are down, SMB, some dockers (pi-hole), while a few keep running, partly (plex).
The first crash happened during a monthly scheduled parity check, the second happened just last night.
I've been force to hardware reset and ofcourse a new parity check will start.
I'm enclosing both diagnostics file from after the reboot, just now and the logfiles I've extracted from my syslog server surrounding the crash.