Have you tried deleting the history for that book? I feel like I've heard others complain about this problem on the 505, but I can't remember the fix. I've had slow page turns with PDFs, but nothing that accumulates over time. Does it do this with all files or just this one? Are all your books formatted the same way or are they from different sources? Have you tried using a book downloaded from the Sony store, as opposed to one converted on your computer?
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