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If you have the sd card that came with the phone installed, you need to buy a new one. My phone would always reboot randomly and shut ofc on its own like you described. I pu in a sandisk sd. Card and no more issues since. The sd cards that these phones come with are made in Taiwan and are very low quality which results in inconsistent read/write speeds. This causes the phone to freak out. So get a good quality sd card, preferably a sandisk.
OK, so I call VM about the phone powering down on its own. They say it should not do that and the next thing I know they are shipping me another phone. That was way to easy, makes me wonder whats up with this. The VM guy said this was the first he had heard about the Optimus V doing this.