Maybe Amazon have not been able to identify the source of the problem. I wonder if all the PW's are made in the same factory. Perhaps it cannot easily be picked up during QC, or is too expensive if only a small percentage of Kindles are affected.
Looking on Amazon's UK site, the ratings/reviews of the PW are mainly 4 and 5 star, so it may be that these issues are not so common and therefore Amazon deals with them via customer complaints/replacements.
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