I was just wondering if anyone else is having this issue. My iPod gets pretty hot on the back upper left side, when its charging and I'm playing a game like "CookingDash", but it only gets hot if its charging and I'm playing a game. If I leave it charging, without using it, it doesn't get warm, and if I use it, and not charge it at the same time, it doesn't get warm either. Should I be concerned, and return it???