Originally Posted by Olley
Depending on how you've sorted though your music, the playlist subset may only include a few songs. If repeat is off, the D3 will only play through the last level of sorted songs once then stop. If you are 3 levels in, say choosing genres, then Blues, then an album, the Folder option will either only play the songs in that album (1) or let you cross to the next album under blues (folder). It is a little hard to understand, but it lets you listen across 3rd level sort results.
Just hit the "songs" button to see all your songs, then tap one to play it. It should play through all of your music without stopping. If it behaves, then this is your problem. If it stops without finishing, your music is messed up or your D3 has a problem.