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I had it happen once on my 5555. It was connected to my laptop via a charge/sync cable just sitting there working fine. Suddenly, it did what looked like a soft reset. It turned out to be a hard reset. This was at like 3AM while I'm overseas working all night. Was back up and running in a few minutes thanks to a current backup.
Seems like the 5455 I had did what you described one time, though it has been awhile.
Makes me a bit nervous sometimes though, because I have had to do the old "Pull the battery trick" a few times when wifi won't start on the 5555.
Yes, if it happened twice, I would send it in also.
Best of luck, hope it's back soon in perfect health!
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