Excel iOS app not autosaving and freezing.

This is happening to me almost every time I open a workbook using iOS excel. The app is always up to date. I’m mostly opening large files, but it still happens with smaller sizes. 
It’s pretty horrible to do a significant amount of work and then find out you lost it all bc it is hung up when saving/closing.
whatever you do, don’t turn off autosave because you at least have a chance to retain your work. I don’t like using autosave but I’ve had to recently.

Either way this has just about stopped me completely being able to use excel.
FIX IT!