I am having the same issue in my prs-650. Solved the issue by formatting the reader's internal memory(I tried formatting about 5 times) but it worked only for 2-3 days. I made sure that I ejected the device properly before disconnecting. Wondering whether this is bug introduced by the latest Sony Library software version. I am using 3.3.00.07130.
I am not hoping to reformat the reader again. Using calibre but the problem is with the DRM ebooks.
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