iPhone 4 owners feedback needed with POWERBEATS: First day of use for the most part everything was fine. I still felt the earpieces moving away from the ear canal which then made the headphones sound flat. I haven't changed the earpieces yet but my biggest concern is I'm having communication issues with the headphones to the iPhone 4. It will randomly activate voice control, forward the song, change the song, atop playing the song, or garble out the song. I've only worn these headphones twice. I don't know if it's a compatibility issue with the iPhone or my sweat interfering with the control talk. Anybody else having issues? I hope it's just a defective headphones. Also, I've rebooted the phone multiple times and when I disconnect the headphones the phone works fine.