I had this exact problem, Lindsay, soon after buying a PRS-505 in June. What I discovered -- with a little help from friends here -- is that the device was fatally undercharged using the USB cable to a PC or laptop ... no matter what the battery charge icon so optimistically said. The USB charger is NOT effective. I got myself a mains charger, did a hard 're-format memory' (during which you will lose all books in the device and have to start again). Since I did that, my 505 has worked like a dream. Good luck. Neil
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