Hi all, I use my 3rd gen nano to run. A week ago I started noticing that the sound from one channel its missing. I tried to move the plug of the earbud and it did the trick. The problem is that it happened again and again while I'm running. It's very annoying and kinda dangerous with I'm in a treadmill. I changed the earbud hoping that the problems was the earbud itself. It was not. Any suggestions ? The plug is all the way in. I think it's like there is some loose space there. Would that be possible ? How could I fix it ? Thanks a bunch.