#skull cavern

I was breaking crates on a treasure floor in the skull caverns, but the crate breaking noise continued after I’d broken them! Every action I took afterwards lead to a crate breaking noise, and my game got very laggy out of nowhere. I just went home and saved the game before closing the app...

How do you get deep in Skull Cavern? I can only get to floor 20 with no staircases I see people get to floor 100-200 And how do you do it before 2 AM?