My iphone 5 volume down button doesn't work?

I was casually watching a video, was a little too loud, so I decided to turn it down. But my - volume button didn't work. The white speaker thing didn't pop up. It's weird though, because I can shake my phone, and it rattles, and when it rattles into a certain spot, the - volume button works again. I'm more than certain its a hardware issue. And help?

Go to the apple store and they might fix it or tell you where you can get that fixed if its fixable

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