I would thoroughly check everything. Your car sounds like it has an issue. Check that the car rolls freely without the motor and check the esc settings. I would have thought a 7xl on 4s would fly.
cutoff voltage set at 12 volts. Buggy was checked at the time of lock up and there are no rocks...any where .The motor is very rough to turn if you can turn it at all you can feel it grinding. Drivetrain is very free nothing in the way. It only ran two minutes is because the motor locked up.