Why does the sound on my 2011 MacBook Pro keep dropping out?

Over the past couple of days the sound drops out on my 2011 MacBook Pro. It start about 30 minutes after I've switched on the computer and then keeps on happening every 3-4 seconds. What could be the problem?
I've got a 13" MacBook Pro early 2011, 2.3 GHz.

Hi A,
You are still covered under the Apple warranty. I would contact AppleCare or make an appointment at a "genius" bar.

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