V3 testing is available which is quite stable but you will need to re-install all config changes again after upgrading.
So, If everything is working, wait for the official release of V3.
The log suggests your router cannot connect to the server, so either your internet is dropping (channel, signal etc.) or Safer is hanging.
If it were me, I would try another provider (I think Nord do a 3 day trial) and see if that stops after 30 minutes too - that way you have narrowed your search for the error. But it seems you are not interested in any suggestions but just want it magically fixed! Good luck with that!
@glitch - your suggestion does not explain the reason the connection resumes after the router reboot, as well it does not explain the reason why none of any of the 30 VPN geographies work when the error occurs either. I do not believe in magic or doing things that do not make sense…
when the OpenVPN fails as per above discussion, I found that when I reboot the upstream router the VPN comes back;
however, at times it doesn’t help.
I conclude: there is a problem with the way the upstream router handles OpenVPN protocol (will investigate), however, when it is persistent my MT300n-v2 gets in trouble and require reboot.