Problem playing, the app keeps opening and closing

When I try to play endless survival mode, the game crashes and says there's a problem. Also, when I was about to finish a minigame, the app closed out of nowhere. I thought that when I reopened it I could continue the game as usual, but I couldn't! It restarted on its own and now I have to start from scratch. I don't understand what's happening; it's updated and it still has errors...