My 600 froze when I was quickly flipping through some pages...I didn't try the reset as I didn't know about it then however about (3) hours later I checked and it had shut down on it's own. After that it worked fine...I'm not sure it actually "locked" up but I think the processor slowed down significantly while processing too many inputs. I think it just appears the reader "locks" up when it is actually just running extremely slow.
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