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My first Kindle had this problem. I exchanged it and the new one (same model) does not. I don't see complaints about this any more on Kindle forums, so somehow they seem to have taken care of the problem through some quality improvement or better calibration. So at least Amazon considered this a defect (and I would also).
It was definitely not a problem with temperature extremes (which might well cause some other problem): I had a problem with the very first page turn after exposure to direct sunlight. There's a physical phenomenon known as the photoelectric effect where electrons are emitted from matter when exposed to UV radiation. I suspect that might be at the root of this problem, but that should be the subject of a science project.
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