If the game is running slowly or crashing, try clearing the cache, closing other apps running in the background, or restarting your device. Make sure that your device meets the game’s minimum system requirements and that your game is updated to the latest version​​. 

If none of the above has worked, contact us from the Settings in Tune Town and let us know any details of your issue and what you were doing when the issue appeared (any screenshots or video recordings you make would also help us a lot).