I've had my 2017 G80 3.8 Ultimate for a year now. Bought fresh off a lease w 39k miles. Love the car. Just recently the Nav system freezes after a while. I noticed it when the MPH icon on the heads up display wasn't changing with the posted speed limits. Pushed the Map/voice button on the dash....nothing. When I stop, turn the car off then on it works but only for a few minutes. sometimes it works normally. Has anyone had this problem?