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The same thing happened to mine,
I've bought my first e-ink device mainly for better battery life. It actually happened twice I was nearly going to return it to Sony but before doing that I decided to format internal memory, reset, put books back on and recharge.
That was on the 31st October, (the last recharge) it's still showing full battery life which is the longest it has lasted so far and I've completed reading a book. I'm feeling more confident in mine now. It must of been running something in background, have no idea what though, (I was suspecting the power save book cover too due to only reading a little bit of it before the power running out) don't listen to music on it and don't use wifi so I have no idea.
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