My beautiful silver 600 froze yesterday for the first time. I was just reading and the page wouldn't turn. Reading a book I purchased from Sony and loaded via the eBook Library (3.0). Wouldn't do anything. I hooked it up to my laptop, hoping to get to the User's Guide. The Reader showed it was connected. The laptop said connected device had a problem and wouldn't work. So I unplugged the USB and voila! . . . it has worked fine ever since (a full day, lol!

).
Dunno what happened or why, but as long as it comes back to me I am a happy camper!