I have a P2V+ V2 I bought last May. Suddenly, my range extender does not stay charged at all. It will go from 100% charged down to 50% in one total flight, dies by the time I do a second. Also, it starts loosing video signal on my iphone 6 within 500 feet sometimes. I have done a hard reset and re-binded and same thing. Could it just be going bad? I have contacted DJI, they said it would be a 6 week turn around which is ridiculous. I then contacted USHobby where I bought it and they want me to send the whole unit in. Could they just not replace my range extender for another one?