On a related note about heat: I've noticed that when I leave my Mk2 plugged in all night, for example, while syncing a lot of data, it's quite hot to the touch in the morning. My Mk2a, however, is still cool to the touch.

Is this a known bug in the Mk2? Everything seems to work okay, as the Mk2 spends its days in the car, where it turns itself off, whereas the Mk2a spends its days at home, plugged in to the wall and the home stereo.