The oval-shaped silver button on top of my iPhone is getting loose. If I shake the phone lightly I can hear a rattle and the button is a bit more recessed into the body of the phone than it used to be. Is anybody else having this problem? My friend had a 3G that he had to take back and get replaced because the button completely recessed into the phone. Is there a fix for this, or at least a way to prevent it if and when I get a new one?