Previously had an issue where it crashed my phone. They fixed it in favor of a scam technique. Pretty much, they'll take songs off your list, and make them impossible to get a perfect score on until you refresh the game. Why? Because, conveniently, beating a song gives you points towards opening crates. You can't play when you have three crates. But, when you don't get a perfect score, they shove an unlimited play ad in your face. They make you fail a perfect score to bombard you with ads. Awful