When in the Battle screen I keep getting dumped back to the main menu. This happens within a few seconds of entering the Battle screen. I can play many games then it hits, and other times it happens the first time I press the button.
I also get dumped back to the Main Menu after each match of 2v2 against AI, hosted by another player. This repeated each of the 7 matches we played together.
It's annoying. Even restarting the client does not fix it. Much spamming of the Battle button seems to clear it though for a game or two.
I had the same problem. I could not resolve the problem before restarting the computer