For the third time, the tracks in my three private playlists have hopelessly disappeared. This is very annoying. How can this be avoided? Will there be an update soon that will fix this bug?
I believe there is at least a known situation when they actually get lost (well, more likely deleted...), and that's when you perform, for whatever reason, a factory reset. If that happens to you on a different scenario (even when just adding a track to it...) you should document steps to reproduce, and report it as a bug.