I went for a short flight this morning and when landing in a paved parking lot the bird tipped backwards and two rotors jammed. I hit the power off but had to do that twice before the motors stopped. I set the P3A upright and fired up the motors.Three started .I powered down again and checked for free play in all the motors. Everything felt fine but when I tried to power up again nothing worked. I wouldn't think it would be an overheating issue since I've had the same problem before on landings with another P3A and and a P2. I'm using the Litchi app and camera works fine. It just that the motors won't start up. Any ideas? I really would like to have the drone working for an event on the first weekend of November.