Engine Grinding Noise problems of the 2014 Land Rover Range Rover

My vehicle was traveling at 40mph at a straight path on city roads with no obstacles or detour when at an instant the vehicle's drive mode logo on the shift knob began to blink continuously followed by system error code warnings flashing on the entertainment screen and driver screen and full loss of vehicle control. With complete shut down including loss of all electronics electrical power and engine failure thereafter causing the electronic emergency brakes to activate and locking the wheels. At which time the vehicle came to a violent and sudden stop resulting in a load grinding noise coming off the engine bay. The vehicle was unable to start due to no return of any electrical power to the systems electronics including exterior and interior lights. I waited for about 15 minutes before trying to start the vehicle, which took a few tries before power and vehicle engine engaged only to have the same complete vehicle failure and shut down repeated only after 200 yards from the initial failure resulting in tow service having to be called out. Keep in mind this is not the first nor the second recurrence, it has been an ongoing issue for the past few months only to be told that the problem was diagnose and corrected by an authorized Land Rover dealer. Which is far from the truth in regards to the health and safety of this vehicle. To date the cause of continued failure is unknown.