I'm experiencing similar issues, logging out every 5-10 minutes too. Hopefully, they'll address this soon to provide a smoother experience.
You guys have to accept that as part of Betpanda features unlike other casinos like Stake that keep a user pernenrmently logged in on the same browser, Betpanda has a system that auto logs users out at regular intervals.
What I will advise you guys to do is to try and save your login details on your password manager and auto-refill them anytime, at least that is how it works for me, until the team finds a way to work on that feature since many players are already complaining about it.
I just try to login just right now, and I don't see any issues.
And then tested it using VPN, it was seamless and smooth login. Of course, if you don't do anything, it will automatically log you off from the site. But if you are playing then I doubt that they will do a auto log off.
I also have the password and login details save, and I think that should be the best approach, at least for me.