Musescore 3 crashes while saving

Hello,

i wrote a 11 pages score with a full orchestra (file attached).
Every time i try to save or even when i write notes/ play the score Musescore crashes.
I don't know why, can anyone help?

I'm not sure if i need a new Music program (e.g. Sibelius Ultimate even tho it costs 300€).
I would love to use Musescore as my Music program, but for now i can't work with it.

Thanks a lot,

Felix