I just started using my new Tello. It was working fine for about a total of an hour or so(more or less) total flight time of 8 to 10 full battery flights. My son had it on a flight and a few minutes into a new battery it stopped taking off properly. I don't know if he crashed it or not, he says it just fell out of the air. The exact problem is that it always flips diagonally to the rear right as if the front left is overpowering it. It flips and shuts off. I tried changing out that rear right prop and no difference. All the props spin equally freely so it is not stuck or sticking. It get power and turns. It just seem like not enough. I tried checking to see if it will take off in the throw mode to check the prop spin. When I start it they all turn equally fine for the 5 seconds before shutting off with no difference between the back corner prop and the other three. If I try taking off like that it flips itself and shuts down. Everything I see on the internet with this uneven flipping problem says it comes from the wrong prop on that corner but it is the correct prop and flew fine with it for an hour before this malfunction started. Editing this...I just tried it again and it seems like the back prop is delaying its start by a bit and a few times did not spin at all so it is definitely something wrong with the back right corner. Is this likely a motor problem or a wiring problem?