I don't think that Sony rep who told you it discharges knows what he or she was talking about. Yes, the Reader will discharge if you plug it into an unpowered USB hub or turned-off computer, but it doesn't charge first! And if you plug it into a wall charger, it'll charge until it's full, and then the little light will go out. It doesn't cycle in some strange fashion and start stuffing power back into the wall! Batteries don't work that way.
You might need to try a hard reset.
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