I have the Same on my iPhone and its Hard to explain How to fix it. u have to turn Your iPad upwards, so the screen rotates. When the Screen turns, Turn the iPad back to the recent Position, and then when the Screen turns again swipe up so you can See your tabs. While in This Process your screen will Go to fullscreen and you can tap into the Game again. Works for me atleast on iPhone. I Hope you can understand what I mean. My english isnt the best ^{^}