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Direct sunlight can cause some funny fading on parts of the screen, but once you take it out of the sun it goes back to normal. IOW, it's not a permanent effect. I have never seen any explanation from eInk or the various manufacturers as to why this happens though.
The other cases I've heard about sounded more like individual defects, which I assume would be covered under warranty. I don't think it's a wide spread problem.
I don't know of any correlation between lights spots and excessive pressure.
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