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I thought I read in one of the threads that there was an issue with the unit not actually sleeping when the Kobo App is left running. I would make sure everything is closed or just turn the unit off. If it is a common issue it will probably be addressed in an update.
I had my android phone do this a couple times where the screen was off but it wasn't actually asleep and quickly depleted the battery. One of the Apps was not allowing it to go to sleep.
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