I just got a Sansa Clip+, and was trying out the FM radio. It was working fine, then I pressed the control to adjust the volume, and the audio cut out completely. I can listen to songs that I download to the player, but there is now no sound at all from the FM radio.
It is possible that I hit more than one button at a time while I was trying to adjust the volume, since the Clip+ is so tiny. Could this have muted it somehow?