I had the same issue. I worked off-line over the weekend, took copious notes, and when I got reconnected on line, the following sequence happened:
First - the screen went black, couldn’t get it restarted. Tried to close app, then restart - no success. Shut down the iPad, then restart - no success.
Second - after some period of time, the app came back to life, but my recent note (while working off-line) it was not there.
Third - tried to sync, tried to check off-line work - no success.
Any suggestions? These were very important notes I want to recover.