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you mention you're using the official sleep cover. could it be a sleep cover issue? i know people have had issues where a sleep cover causes a battery drain (though i'm not sure if this is still possible with the 50% battery remaining showing). I know I've had the battery drain quickly if the cover's magnet isn't lined up properly. When new, it never happened, but as the cover aged, it happened more. it's my backup reader, so I just tend to turn the power off, since I don't really use it often enough to need the convenience of the sleep cover these days.
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