Songs disappearing from iTunes playlists even after backup restore - HELP!
I've made several playlists over the years on iTunes (combining newly purchased music from iTunes with imports from my own collection). Three months ago I joined Apple Music - I don't know if that is related to this problem.
On the playlists created prior to joining Apple Music, several or all of the songs have disappeared from the playlists - and even my library. It doesn't matter if they were purchased from iTunes or not. There doesn't seem to be a pattern to it.
I have read many, many threads here about what to do. It does seem there's a corrupt library. So now I've tried replacing the iTunes Library .itl file with one from Time Machine from a few months ago. At first, all the playlists were intact - I had one open in front of me - but then in an instant, all the songs but one disappeared again before my eyes.
I tried the same thing, but this time I disconnected from the internet (like this post recommended: https://discussions.apple.com/docs/DOC-6561), turned off iCloud Music Library, replaced with the older .itl file, started iTunes ... everything looked great again. Then I connected to the internet, turned on iCloud Music Library, and the playlist songs just vanished again within 20 seconds. HELP!
How do I get out of this endless loop, so that iCloud Music Libary doesn't keep replacing my "fixed" library with the corrupt one?
MacBook Pro 15", macOS 10.14