In a parking lot after backing out from the spot and entering car in drive mode - there was spontaneous, sudden, uncontrollable acceleration and spinning of 360 degree on extreme speed bringing the car in the same spot and stopped only with colliding with other parked vehicle on passanger side , pushing it further and damaging another parked car. During the spin process it front of the car first collided rear end of the car parked on driverside, than curb ,than the back of the car parked on passanger side. This entire event happened in fraction of a second without knowledge of the driver , immediately after the car was put in D mode from R mode . Suspecting some sort of TECHNICAL/ MECHANICAL FAILURE that should be further investigated for general safety. The car was regularly serviced at Audi dealership and there was on going issue with SOS SYSTEM notification trigger, which was addressed to Audi dealership multiple times and they tried to resolve it . The latest same issue was handled almost around a month of the accident. This car is technologically extremely advanced car and has every safety features in built. None of the features came on rescue to notify / stop the car . Even airbag didn't blew up on multiple collisions during that undescribable spontaneous acceleration and spinning of a STANDING CAR! Both Audi USA and GEICO are informed about the accident and they have assured investigating the incident too.