My dad's first 8220 Flip also restarted on multiple occasions before he got a new one. It would shut off while he was in the Media section, Address Book, whatever. I went on here to see if it was an ongoing problem that had already been reported and there were a few threads reporting the same issue that my dad was having. We ended up exchanging the phone for a new one through T-Mobile and now his phone works flawlessly.
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Rock on forever. \m/
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