I have recently moved my STI from a dash mount (black dash) to a stealth mode out of direct sunlight. As a result, the heat of the RD has been reduced considerably. Prior to that I had loosely covered it on the dash with a single page map on white paper that had reduced the heat somewhat while also covering it from direct view. I wonder if some of the problems some people are having with the STI are a result of the unit overheating on the dash in direct sunlight. At present, even after eight hours of driving the unit is relatively cool, and works very well.