Relativity_17, on 19 December 2012 - 16:10, said:
It seems to do this whenever you're syncing music between two different machines through the Music app, without buying a music pass. There are periodic ads, and the player also stops and asks "Are you still here" every once in a while, even if you're only playing music that you own.
It ****ed me off, so I turned off the syncing in the app and just use Skydrive to sync my music folders across my computers.
Had the same issue. The Xbox Cloud thing just does not work correctly and there isn't a way to reset what you want to sync.