Excel iOS app not autosaving and freezing.

Having same problem. If you make a couple of quick edits and close it right away, it saves it. But if you’re spending more than a few minutes editing a file, it hangs and won’t auto save everything you’ve done. Have to close the app and reopen to access again.  It may save a few edits but not all or most of them. On a spreadsheet there is a little group type icon by the cell that it stopped saving edits at. If you open and reclose the file right away to auto save, that icon goes away. In order to use it you have to keep shutting and reopening the file every few edits, which is really annoying.