Encountered problem while driving GV. While going down a hill and then getting to the bottom, the GV will start tumbling and won't stop. The only way that I can get it to stop is to ALT-TAB and close the game. Otherwise, the GV keeps on tumbling and the message says that you must be completely stopped before you can go to the tower. Only thing is you can not stop the vehicle. So far it has happened in the Tiger and the Panzer...........I havn't tried all the other GV yet.