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That's really starting to sound like a hardware issue. It's doesn't appear to be book related at all (since it's happening on almost everything you're testing) and it's not being reported elsewhere (with the amount of books you're having the issue on it doesn't seem like some weird quirk so if it was firmware it would be showing up elsewhere). Factory reset should have fixed a bad load of firmware so I'd be looking at an exchange based on something wonky with the hardware.
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