OPNsense doesn't respond, Unbound service stops

[Arno Thuber]

Hi there,

I'm running my OPNsense (currently 22.7.10_2-amd64) on a dedicated hardware for nearly a year. And all in all it's performant and serving me well. But from time to time it has problems. I don't know if they're related, but would like to list both, in case they're.

1. OPNsense doesn't respond anymore, no UI, no SSH, not even responding to ping.
In this case, I can only switch the hardware off and on again.
2. OPNsense is up reachable via IP but not via hostname. After logging into the UI, I see unbound service is stopped.
In this case, in most occurences it's possible to just start the service again via the UI.

Those problems occour about every or every other week. But yesterday I had the first case thrice within half an hour and the second case this morning. So I now need professional help.
On my linux boxen first thing I do is looking into the syslogs, but I somehow can't find anything interesting in OPNsense under System / Log Files.

What would be the steps for trouble shooting?

Best regards,
Arno