This seems to me to be a not infrequent problem. It has happened to me about 4 times over the last 3 months since I received the PRS 600.
I eventually decided that a soft reset was the only solution. This is a nusaince as I read several books at once and lost all the pages that I was on.
I enjoy the technology of my laptops and iphone and feel that Sony has really poor software on these readers.
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