Hey guys, ZombiElvis here!
When you play a PVZ2 Game, any level, when it's charging or not, NEVER EVER Press HOME BUTTON!. When I playing at Wild west (Lucky, gotta key) the download (secret) is complete, so I pressed home button. When I'm back, it can't be open. Sometimes in black background like Pvz 2 Open but suddenly closes, or after the loading bar is full, the game suddenly closes. Must reinstall, lose your progress!