Musescore crashes when copying and pasting piano passage

I am writing a set of concert etudes for solo piano. Whenever I try to copy and paste a certain passage of 5-6 measures, the entire system crashes. I have tried this 3 times in a row and achieved the same result. I am not sure what the problem is. Everything is on the normal two staves, I don't have any crazy parts, and copying and pasting similar parts has been zero problem for me.