I have recently begun having a problem with my supplied iPhone 3G headphones. When using, the microphone button does not pause, restart, or advance tracks in iPod mode. In addition, when I make calls with the phones in while having this problem, the microphone simply does not work, and no one can hear me on the other end. The solution, thus far, has been to keep reinserting the phones into the iPhone until it properly recognizes the microphone/button. I have duplicated this problem with three headphones. Does anyone else have this problem (indicating potential software bug), or is this an effed-up iPhone?