ive been using evernote for iOS for years, currently on ipad pro. if I have sketched notes using the pen, then flick over to another app (eg mail), then return to evernote a few minutes later, often the sketch is lost and the note is empty. I think evernote is restarting when I go back to it, and not saving the open note. The only solution is to hit done before multi-tasking away, but this isnt practical everytime. Nor should I have to do this. this is incredibly frustrating as I use it to take notes in meetings.