My speakers crackle out for a few seconds

Hi i have a macbook pro retina 15 inch mid-2012, my speakers occasionally fizzle out for a few seconds and then return to normal. Do you know what this could be?

Try a SMC reset
http://support.apple.com/kb/HT3964
And a NVRAM/PRAM reset
http://support.apple.com/kb/HT1379

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