I've noticed a problem when I've been out on a run with my iPhone. Late in the run the music will start stopping and starting and skipping around. I suspect the problem is in the Apple headset. I think sweat is getting into the mouthpiece/pause-advance gismo and sending false signals to the iPhone. I've also noticed (during runs) that the pause-advance feature is inconsistant; sometimes it advances, sometimes not. I would like to upgrade the headset to the V-Moda Vibe headset as soon as those are available with the call receive/hangup function. Has anyone else noticed these problems.