My reader freezes up like this every month or so. Plug your reader into a power source in case the reason it froze was a dead battery. Press the reset button the back and hold it down for a few seconds. Then slide and hold the power switch until you see the little amber light turn on. The reader screen should flick off and then back on, and then go into the boot screen. It will take a while to restart, so be patient. It will also not remember where you were in your book, which is annoying.
These sorts of freeze ups keep happening to me, and not just with certain books. I'm tempted to get a 600 just hoping it won't crash like my 505 does.
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