Not sure this is valuable but just as an update. I kept noticing that notes were missing from the app even when i was still signed in.
So I updated the app to the latest version, and then something red flashed after every time it failed to save a note (it's not every time, maybve 1 of 5, usually a bunch in a row). If I open the "task manager" I can see the error message.
The error is only visible in this view, if i try to open it the app just turned blank.
I'm using other ways nowdays so its not an issue for me anymore. But feels buggy.