Anyone's sound just decide to stop working??

[FutureGreg]

Sometimes my volume drops down to vibrate and I can't set the volume with the rockers or the sound settings! I have to reset the phone to get it back. Has anyone else had this problem/ find a solution?? :blink:

I'm running in the Background
SwipePad
GoogleVoice
Facebook
Skype
GoogleMaps
Words Free
Pandora

Things that I'm worried about having installed
Zedge
Tunee Music