I have a Pioneer head unit in my car with a front USB, and it came with a nice short USB cord which works well in a car. Well, I have my iPhone 4, synced it (which took the same music that was on my 3G). Now, while driving, I hear crackling in the music. It's not constant, but it's there randomly, and it wasn't using my 3G. Nothing changed but the phone. Could this be an iPhone issue, or possibly the USB cord Pioneer gave me with the head unit doesn't work as well with the iPhone 4, did something in the dock change?