Macbook Pro sound sometimes won't work. Took into Apple to be fixed. Still not working.

I purchased a Macbook Pro in July 2014 so my computer is still new.  There is no damage to it (it has never been dropped and kept in case).  My issue started about a month to month and half ago.  When watching netflix the show will stop and when I try to hit play it comes up as an audio system error. 
The sound won't work and then a few minutes later it'll turn on, as if it was lagging.  For example I would send an email and try to hit the volume button to get the sound to work and then a little later I will hear the whooshing sound from the email and the sound adjusting sounds from the keys all at once. I followed the steps from netflix to fix it which were to uninstall and reinstall silverlight.  That still didn't work.  After a while I took it into Apple and they replaced the switch board.  I got my computer back yesterday and today it is still not working.  I have done everything I can think of to fix it.  What else can I do?

Return it to the repair shop.  Tell them they didn't fix it.  Take full advantage of your warranty.

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