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This is almost certainly a temperature problem, not a "sunlight" problem. The surface of the screen becomes hot and the ink doesn't 'stick' properly on a page refresh -- turn the device upside-down, change the page, and turn it right-side-up again and you'll see what I mean -- right back to 'normal'. Turning the device upside down every time you want to turn the page is not a "solution", though, obviously.
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