I started using the app a few days ago and created 8 fretboards. I noticed that often certain notes keep dissappearnig on their own even though I constantly save my work. For exampe, I created 8 diagrams, and they got ruined because 90% of the notes all of a sudden dissappeared. The “Undo” function shows “0” so it is not like I took some action that can I undo to get my work back.