Sound on my IPhone 4 stopped working randomly?

Okay so I was just on my phone watching YouTube video when all of a sudden when I went to watch the next one it just stopped working.

There was no noise that indicated something was broken, so I just assumed I should put some earphones in. When I put my earphones in it didn't make a difference I still don't have sound.

I'm on IOS7 and my iPhone is in good shape.

Turn off, turn on. Works like a charm. Same thign happened to me.

Restore to factory setting

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