I've been having some problems with the Notes app ever since I upgraded to 4.0. It often doesn't save the changes in some of my notes. If I edit one and open it later, It will open an older version of that note without the changes. And even while I'm changing a note, sometimes it will undo to a previous state, without telling it to undo. So I pretty much have to copy the entire note every minute in order to make sure it doesn't randomly change. Has anyone else experienced this?