We just started seeing this trend recently since folks are returning back to the game. We’re still gathering information and what helps in the mean time 
The “attempting to reconnect” issue is a generic message since it can be caused by other connection issues, so old posts will exist though the issue may be different.
In this situation, we have seen a consistent trend in reports along with the same description of disconnecting within 5 minutes, which matches up with how mitigation tends to work. Ports likely wouldn’t cause the specific disconnections after 5 minutes, but there is a guide on this external portforward website if you wanted to give it a try.
We’re gathering ticket reports along with forum reports so hopefully we’ll see some additional reports here. I’ll update here if we find anything new with our ticket reports