This is all speculation as I have not kept up with the original thread...
If you have a P2V+ V3, then you need to open up and check your ESC's and make sure they are 2.1 ESC's. There is known batch (random serial numbers) that use "left over" 2.0 ESCs that are allegedly incompatible that causes the mosfets on the ESC to heat up and short the motor wires and hence "short out the bird" and shut off in mid flight.
Another theory in that same thread (I cant find it) that also talks about the "solid singular motor wires" that break from the soldering points micro-vibrations. This can be prevented by using a glue gun on the solder joints and wire.
If you do decide to open it up, take a photo and post it. Many here can identify the issue.
If you this does not make any sense, then I suggest you not to open it as it will void warranty.