actually, this same exact thing happened to me. Was flying for about 6 Minuetes, was about 17,000' out, was just like any other flight & all the sudden lost signal, I did not panick as it happens all the time I do long distance flights and I regain signal after a minute or 2 after it gets a few 1000 feet closer via the RTH feature, although it did not this time, 2 Minuetes passed and nothing so I jumped in my car and headed towards where the drone was, regained reception after driving towards the drone 1-2 miles, to my surprise the p3a was sitting there, even tho I have it set to Return To Home in settings @ 100 meters, if I didn't drive towards my p3 it would have sat there, lost all battery and dropped from the sky like a brick, and broke to little pieces as it was 399' high. This was the last straw, I had had the drone for 2 weeks and with no crashes the LED housing that shields the p3 LEDs was loose, and this had already happened once before, so I returned the drone to authorized amazon seller and got a full refund.
Still haven't decided if I'm getting another p3 yet, maybe I'll wait and see if a new models announced, but I sure do not miss the situation I was put in not once, but 2 times.