just recently my game automatically closes in win 7 but my brother playing at win 8 is not having this problem
I'm on Windows 8.1 and it is doing it to me as well. Game has been fine up until this morning after maintenance and w/e small patch my launcher downloaded. Sometimes it closes in a matter of seconds of getting in game, other times it will do it after some time of game play. Just random and no warning, game just closes.