This sounds similar to my problem, so perhaps I won't start a fresh thread.
1) I pick a song and engage it to Pay.
2) Roughly a 50-50 chance that actual song will play or some random Shuffle choice.
3) I have selected and deselected "Shuffle" about a dozen times.
4) The fun continues in that it is not simply shuffling. It is playing a totally different song while displaying the song I selected. For example, I chose a "Hard Day's Night" by the Beatles. The screen and album art and title all indicated "Hard Day's Night". What is playing, however, is "Another One Bites the Dust" by Queen.
5) I tried tapping the "FFwd" or "Next" arrow, to scroll thru the songs and see if there was any pattern to this uintended shuffle. About four songs along, the music stops. The screen is not locked up or frozen. The play button simply gets no action. The song will not play.
6) In general, it seems to play a half-dozen random songs (staying within the Playlist) and then gets tired and doesn't want to be bothered any longer.
7) As I say, I've tried to deactivate Shuffle several times. I've done a total power off and restart twice. I've plugged it into iTunes and de-Sync/re-Sync the entire music library twice. The phone was about 70% charge when this started. I've brought that up to 100% before experimenting.
Any thoughts would be appreciated.
Happy Saturnalia!
iPhone 4, iOS 5