I read that a dirty screen and or cover can affect battery life even when in sleep mode. I think this may be true. If I have a crumb on my reader it will not stay asleep sometimes.
I have also read that the totally discharging it and recharging it repeatedly will eventually resync the battery. (2 or 3 times?)
Still it should be under warentee and that might be the way to go.
Helen
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