MMI (Infotainment system) shuts down periodically while vehicle is being driven or is idling in Park. Radio, navigation, etc., are affected. Also, the vehicles’ collision warning system shuts down at the same time. Generally, the system will reboot itself within a few minutes. There is no real pattern to this issue as it may occur several times during a short trip in the car. The next day it may not happen at all. I contacted Audi dealer who stated they are not familiar with this issue and knew of no fixes.