Hemmi could be onto something here. I vaguely remember Sony's being a little less forgiving of 'bad' books, and the battery drain certainly could be being caused by a certain book.
You said you did a factory reset, but did you just load all your books again after the reset? If so, it might be worthwhile trying another reset, and this time only loading a small batch of books on at a time and checking for battery drain after each batch.
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