All I did was add a song, i.e. dj quik - trouble. Then I did a sync and it started going crazy. Previously I had added 5 songs from radiohead that weren't tagged yet. After I synced, all my playlists were gone and when i searched for a song a found it , it would restart the player and sat rebuilding database. After I synched it with emplode for some reason it found my playlists and worked fine. I don't understand. Must be one of those days.