It's the nature of the device. A solid block of aluminum is basically one giant heat sink. You would be surprised at how much energy is expended (and, consequently, heat generated) changing all those 0s to 1s and back again. Mine has gotten ridiculously hot before, though a straight hour of Beach Buggy Blitz will do that. Look at it this way: better the heat is moved out and dissipated through the chassis than sit around and cook the components constantly.