Ran beta 2 for a couple weeks. I did have at least one incident where I once again needed to reconnect to the AP to restore connectivity, however overall the connectivity issue is much better. I will try beta 4 now.
I hope all the issues are resolved and a final release soon - my restaurant business runs on a Peplink AP with 3.5.4 and it has caused some issues there too. It should not need to be said that this connectivity issue is not acceptable, particularly in a business environment. That said, thank you for working on this, I know you guys are trying to fix it.