I was attempting to park my car at parking spaces inside a garage. The car was about half way into the spot, and I released the accelerator to slow down. Suddenly, while my foot was off the gas, the car accelerated on its own, lurching forward and hitting a barrier, which protected against falling off the side of the garage into the floor below. The car sustained minor damage to the hood, but it could have been far worse; if the car ran through the barrier, it would have fallen one story down to the floor below. I am now way too concerned to drive the car, and have not driven it since. I took the car to a Tesla service stations and they said that they cannot reproduce the same phenomena, and that the car passed their diagnostic check. Currently, this is the only person to inspect the car. During the sudden acceleration incident, the car did not make any warning sounds, which it typically does when driving into a parking spot and approaching a barrier or wall.