I finished building my deck in arena, and i clicked the play button, nothing happened, so i clicked back, then went back into arena, then clicked play again. No popup came up, and it immediately started a game (it said [playername] has sign on, or something like that), and before the game began, I got disconnected with a screen that said "closed" and telling me to restart the game. I restart the game, and I had a loss in arena without even playing the match.