My Sony 650 never rebooted itself in the 2 years I had it. My next reader, Kobo Touch, rebooted itself regularly, roughly every 2-3 days. I have had my current Paperwhite for 5 weeks now and it hasn't rebooted itself at all. The Sony and Kobo were out of the box while my PW is jailbroken. The Sony appeared more stable, but with no font, line spacing or margin options which made for a less enjoyable reading experience.
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