I had my 950 battery drain overnight recently with the wireless switch turned off. I thought it was odd. I charged it fully, read for an hour or so, and then the same thing happened again. I powered off and back on and it's been fine since. My theory is that before this behavior occurred the first time I had made a large quantity of notes in a very large EPUB file (2000+ pages). Even though I had exited the book perhaps there was some process still working in the background that should not have been. Maybe that's why the power off/on cycle helped refresh everything.
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