I'm a little late to this discussion. But my new iPhone 4 volume buttons have a little "play" in them. Called apple care. They said it wasn't a known problem. AT&T store said the same thing. Played with the phones at the stores. Most of them had play in them. I'd bet money, for those that have a phone, and their volume buttons don't have this "play", it will eventually occur. Also, if you look closely, you will see that both buttons move at the same time in the same direction. It looks to me as if it is one piece (not two separate buttons).