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When you say "powering down" what exactly are you saying? When you hit the power button, does the phone boot like on a soft-reset or just instantly show the today screen?
I doubt a wireless issue would cause the device to power down. If anything, it would wake the device trying to find an AP.
If the device is powering all the way down, not just going into a "suspend" state, then yes, it is possible (and probable) that the hardware is defective.
If the device is just going into suspend, then it is more than likely a software issue.
Let me know how the reflash goes and dont forget to hard reset, reflash, skip carrier customizations.
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