Not self hosted but at work: after an update to both our firewall cluster nodes they both acted wonky, restarted 5 min after booting, ssh connection wasn’t working half the time, dropped packages… the problem persisted through multiple reboots, support had no idea.

the fix was to pull the plug entirely, wait 10 seconds then power them on again. on both nodes we had this behavior and both worked again after losing power for a few seconds.

seems that even for business appliances “have you tried to turn it off and on again” is a viable solution.