I don't know if this is because of the same issue, but it may have to do with the sideloaded books/power off/sleep issue. I know that sometimes when I turn the book off, and then turn it back on again, it will sometimes revert back to where I had started reading my last session. It's almost like the power off mode isn't waiting for the book to save its position before turning itself off. I don't know if the same thing is happening when the battery gets low as well, in that it's shutting down all non-essential applications without saving anything it has in memory to try and save the battery from going completely dead.
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