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Ever since removing the book from it's cover the issue has disappeared. I reloaded everything then deliberately kept it sleeping for a few days, only waking it to check the battery, and it's still at 99%, so it was the cover all along.
Which is annoying 'cause if I'd just checked that first I would've saved myself a lot of hassle.
Thanks everybody for the suggestions anyway, I appreciated all the offers of help!
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