There's been some chatter on the Amazon forums about the longer bars on the sides warping with use, especially if the user habitually pressed just the very bottom corner of the bar. It wasn't widespread, and it seemed to be people who had gotten some of the very first Kindles. Maybe it was a tooling issue, or a mold-quality issue or even a plastic quality issue. I haven't seen anyone talking about this recently (like in the last 3 months or so).
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