Differential Unit problems of the 2014 Audi Q7

Randomly, when the vehicle comes to a stop, the wheel will turn to the right 90 degrees, yet the car would go straight. This happens randomly when driving too. The wheel turns to the right 90 degrees, yet the car go straight. You have to force the steering wheel back to straight. Dealer says nothing is wrong with the vehicle and can't duplicate the events. A loud clunking/banging noise when the car is shifted into reverse. The whole vehicle will shake. The dealer did duplicate the noise, yet they couldn't tell us what was causing it so they replaced the differential. That didn't stop the noise, so the dealer brought in a technician from corporate. This person found nothing wrong. After having the car to the dealer 5 times, they told us there is nothing wrong. Many times, the back-up camera will not turn off after the car goes from reverse to drive. This means the radio/navigation can't be used. Sometimes when the car is put into drive from reverse, the camera would turn off, but the radio would not turn back on. When the car was in park and not running, the radio will turn on when the car door was opened and can't be turned off. To reset things, the car has have to be turned off and restarted or turned on and then off and then restarted. This is the only way to resolve this problem. Also, when trying to open the back hatch using the release on the driver door, it wouldn't work. You needed to turn the car off, then back on, in order to get it to work.