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Prem, my point was looking for serial numbers probably won't help much, since it's been happening over a period of time with several devices. If it really bothers you, I would replace it. Mine does it but I work around it easily (not enough to go through the effort of being without my 505 for a period of time). It is a Sony problem in the sense that you will need to get a replacement from them.
It isn't the nature of eink, either. You are supposed to be able to read in direct sunlight.
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