I just had the same thing happen to me. My PE started acting really strange. The tablet side locked up and the E-ink side was showing double images. I tried to power off by holding the power button but it would not power off. I used the reset button and then when I restarted all the default settings were back but my library and apps were still there. Now since the reset I have been having those hibernation issues which I didn't have before using the reset button.