Hi, I found my early 2013 15 rMBP sometimes makes click or pop sounds from headphone, which just sounds like the headphone is plugging in or out of the socket (power current suddenly on or off). It usually happens some moments later (like couple minuets) after sound (of video, flash player or even system sounds) stops, but may not comes out every time. If I remember correctly, this click sounds sometimes repeat itself even if no sound is made from the rMBP after an earlier click sound. I have asked the apple genius, they must keep the computer and hear the sounds by themselves before they can do anything interesting. But I'm not sure this will always happen as I expected. Does anyone else suffer from the same problem?