Files on IPad Pro keeps crashing :(

Only a very sad sap would use a frowny face on a professional, online discussion post, so please help me out.

I bought the iPad Pro 12.9 and Pencil 2 because I needed to write on PDFs by hand, big mathematic equations and such. It will crash randomly when I move the page (to zoom, scroll, etc) and I will lose an indeterminate, but substantial, amount of work.

If anyone knows what causes this or how to fix it, please let me know. For now I may simply download a separate app, but most likely just continue using the buggy Files and letting my work fall into a black hole for the sake of convenience.

Thanks for reading, hope to hear from you!