Bringing back the old thread again, but better than starting a redundant new one, eh?
Mine has been doing this more and more. Stock 4.2.2, always has been stock (decided to not root this one from the start). I have been dreading doing a factory reset, mainly because i still had the old google currents app and didn't want to lose it- newsstand is awful. But, anyway, it started powering off randomly a while back, maybe once every two days. The pace has increased to being at least six times a day. The weird part is, when I plug it into a charger, for one to three minutes it just flashes what looks like an empty battery icon..and then, finally, the actual battery percentage will appear. Only then will it power back on.
So I finally did the reset, but it's done it again twice since then. It almost seems to me that the battery is becoming "unmounted" for lack of a better term- or at least the phone thinks it has no battery sometimes.
I called V tech support and they are sending me a refurb. We'll see how that goes. But, for me, this issue has been un-fixable besides just trying another device. It's a shame, I've taken really good care of it.
*edited for 2x post*