While I don't know what specific issue causes this, I suspect it is more a bug in the Sony firmware than with the ePub. I had that happen a number of times on my 505, so you're not alone. I never had it happen on a PDF, but some epubs would certainly cause it to crash now and then. I remember at least one particular epub (although I can't remember the title) would crash the 505 every time. With a couple of other files, the machine would reboot the first time the epub was opened, but thereafter it would work just fine.
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