Occasionally I notice that the sleep cover doesn't put the reader to sleep, or at least doesn't turn out the light on the reader. That's why I really hate that they now have the light go out a few seconds after you close the cover instead of right away, so I end up having to keep peeking through a slit in the cover to watch that the light does go out.
I've usually caught it though at least within a few hours so never had any significant battery drain, but it's possible that's the cause. The light staying on randomly happens when I plug my reader into my PC to charge as well, which is really annoying when it's at night. This has happened on my Glos and the new Glo HD.
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