Just got a Game Boy Micro- love it. However the headphone quality is horrible. I've tried 3 different sets of headphones and all three of them pick up this soft sound that sounds like radio interference. If the game is playing music it is less noticeable, but I can still hear it. Is this a common "flaw" in the GB Micro, or the entire GBA line for that matter? Or do I have a defective unit? Thanks in advance for any feedback!