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Unfortunately the log was too big for the upload so I took the log to warning level. There is only one message popping up and that's it:
"Warning   openvpn    NOTE: the current --script-security setting may allow this configuration to call user-defined scripts"
Otherwise the you can find my custom ping log attached now. Sorry for the inconvenience.

I got two OPNsense firewalls at two different sites. Firewalls A and B each have an openVPN remote server and a site-to-site tunnel with firewall A being the server.
A is running flawlessly for a long time now with an openVPN remote server and B has random breakdowns from time to time without any rhythm. When the openVPN instances of B break down I can't reach the remote server and can't connect from site A to site B but can still ping the OPNsense firewall externally which makes me believe there is something wrong with the VPN setup.
Unfortunately I can't find any hints from the log files either because there is no errors and the debug messages are inconclusive at least in my eyes.
Attached you can find the openvpn log and also a log file I made manually by pinging firewall B via site-to-site every 15 minutes. Maybe it helps to find correlations between downtimes and the log.