Exact same problem.
I experience the exact same problem with my reader yesterday. I was reading a book, my girlfriend called me and I left it on top of our table. After 20 mins I got back to the reader which happened to be frozen in the same page. I tried the power slide on top with no results, then I connected it to my computer. At that very moment I got an area that looks very much like what physical damage causes on a LCD display (i imagine it would be similar on these e-ink devices). I am positively sure there was NO way the reader could have been damaged while lying on that table. I guess it is a manufacturing defect.
This is certainly the very last Sony device I ever get.
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