I have the exact same issue and can't solve it (yet). Has anyone a suggestion??

In my case it started after the recent SSU update, which went well, but now MediaPlayer constantly spins unendingly trying to update the library. There's a film in mediaplayers library that's no longer on the card, but I am buggered if I can delete it from the library, and that's what is causing the constant searching (I think).
I have disabled metalayer-crawler a long time ago, btw.