> I found stations got stuck into the same set of songs and would stop adding new ones.

There was this odd bug on some stations that caused unrelated tracks, at least from a human standpoint, to play. Most notorious were some classic rock stations. After a couple hours of play, they'd start playing comedy. I could understand if there were some parody bands or musicians like Spinal Tap or Tenacious D seeding the stations, but these stations had none of the sort.