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Hooktheory 2 app freezing

Hello,

I recently got the Hooktheory 2 app and most of the time when I play a clip, it doesn’t go in full screen mode like it usually does, I listen to the clip but then the app freezes. I need to close and re-open.
I don’t have this problem with Hooktheory 1.
I have an iPad 5 with iOS 15.5

Thanks