My iPhone 4 (iOS 7) volume isn't working?

It has done this before. I wanted to listen to music (on pandora) and I noticed the volume bar underneath wasn't there. I then opened my control center and the volume bar wasn't there and when I clicked the buttons on the side wouldn't work either. I got it working again the earlier time it happened but now I don't know how to fix it.

Mute it.

Turn off your phone and turn it back on is the best advice I can give. You could try force closing the pandora app as well but that wouldn't explain why the sound bar wouldn't show up in the control center.

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