I've had my PRS600 freeze a couple of times with a full battery. I've brought it back to life by either plugging in the charger (psp wallcharger) or, if didn't have my charger at hand, pressing the reset button to do a soft reset. I've found that sometimes you need to press the reset button several times before the reader resets, one time I gave up trying to reset and after a couple of minutes of leaving it alone it reset by itself.
I've been wondering if charging might be the cause of some freezes. I've noticed that two out of the three times my reader froze I've charged my reader longer than normal, instead of 8-9 hours during the night I let it charge between 16-20 hours. The first time I can't remember how long I charged it but I suspect the weirdly formatted PDF I was reading.
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