@lecmeg: What you describe is a known issue. What seems to be happening is that there is a problem in the book that when it is opened and closed, leaves a process running in the background that is using CPU, and hence battery. Restarting the device will kill the process and return things to normal until the book is opened again. Removing the book isn't really necessary, as long as you restart the device after reading it.
I don't know what is in the book that triggers this. It hasn't happened to me for a while, and I don't remember anyone reporting anything specific about it.
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