HIdeo I think you hit it on the nail there. it always appeared when i would pull the phone out of my pocket it would be restarting. never made sence to me at all. i thought it was a software issue. i was pushing a button on it and instead of it coming out of stand bye it would restart untill i placed it down on my coffee table and it restarted.
i lifted it just an inch or 2 off the table and dropped it and it restarted again!! then i tried giving it a bit of a shake and supprise. restart... so it has to be an issue with a loose battery or connection inside the phone.
i will be taking mine back to trade it for a new one on monday. fingers crossed its a rareissue. it did take me a wile to find this post online so its a good sign not to many people are having this problem.