Hello everybody!
Some months ago, I've had the exact same problem. I was flying my p2v+ (80%+ battery) and when I was bringing it down to land, and when it was about 7 or 8 meters from the ground (23/24 feet) it suddenly lost power, props stopped (no sound, complete silence) and then it fell down from the sky and crashed in the grass. I always check if the battery is correctly installed in the quad, I always do the compass calibration on every flight, and every other thing listed on the pre flight check list. The crash ****** up the crappy gimbal and then I became one more of the million phantom 2v+ users with a useless, expensive and bad quality camera/gimbal that it is only capable to do the chicken dance.
My quad was new, only 20/25 flights i guess. In all previous flights it was everything perfect, no problems. After reading a lot of threads, for months, I guess that the problem caould have been something related to the altimeter or variometer, as I was bringing it down (all the way down on the RC) and if for some reason the atimeter/variometer didn't send the correct descending data to the brain, it may have understood that the drone was on the ground and after 2 seconds it stopped the motors. The other possibility could have been a power contact problem, but I checked the battery and it still had a lot of energy and after repairing all the broken parts (all except the shitty camera gimbal) and after checking all the cables and connections inside, I can fly it without any problem, but I lost all the telemetry, battery info and compas in the app and Im still trying to fix it.
I contacted DJI, and after several e-mails that they didn't answered I finally get a response saying that they need some proof that I didn't crashed my drone, like a video showing how it falls from the sky while I scream: "NOOOOOO!!!" I wonder if they are just assholes or if their mothers abused drugs when pregnant. Are we all supposed to have an extra camera recording video pointing to our drones every second of every flight we make in case it falls? Is that implied in the warranty form? As I live in South America it is not so easy to send the quad back and the wait 2 or 3 months just to get a response saying that DJI is not responsible for my damaged drone as I can't show them any proof of malfunction or factory mistake (That was what they basically told me).
But I consider that the main problem is not a broken drone, but the EXTREMELY DANGEROUS situation that every phantom pilot are facing EACH time we fly one of this dangerous white robotic birds. I can assure you that this drones can fall from the sky at ANY moment. But I still see every week lots of videos and pictures of phantom quads flying over people heads, even DJI publish videos of their drones flying over people when they know that their drones can get out of power at any moment, fall and hurt people, animals or even cars, houses or anything you don't want to hit. The higher the drone flies the bigger the damage. Just ask someone to drop your phantom from only 1/2 meter over your head and let me know if that hurts, now imagine if it falls from 200 or 300 feets...
THIS THINGS ARE VERY DANGEROUS; PLEASE DONT FLY OVER ANYTHING THAT IS ALIVE OR ANYTHING YOU CAN'T PAY FOR!
Fly safe...