Data not reset after reboot but only after switch off/on

[FredFresh]

I have an issue somewhere with a multiwan configuration where I put 3 wireguards to higher priority than the WAN interface.
At a randomic moment (sometime after 1 day sometime after a week) the wireguard connections are note renewed one after another (also in this case with a random delay of days). The VPN log tells me that the handshake is not renewd.

The only way I found to restore the handshake is:
- forcefully change the WAN pubblic address exposed to the opnsense wan interface (restart the modem);
- switch off, wait 30 secs and than switch on the opnsense (just the restart is not effective).

My question is what data/routing/other "resist" the reboot but not the stich off/on. Otherwise everything seems to be properly working and I am not able to find a solution (I have crowdsec and intrusion detection but no alerts are communicated).

I know this is a very weird question, but it would be really helpfull.
Thanks.