Great game, impossible to play

I have an iPhone 6, so this should not be a problem. However, the app crashes every time I go to play a song I had just made. Also, most rhythm games will have a perfect, great, or good system. This is just an all or nothing thing. I would like these changes in the future for a 5 star rating.

Mcjae about Tap Studio 3, v3.8.3