Navigation System Issues
 

Hello,
Recently purchased by Pre owned A8 L. It is loaded and I love the car! I am having a navigation system issue though. I took it to the dealers once and they could not find anything wrong with it. On some days it works fine and then others it just goes off, telling me I am off road and looking like we are flying above the streets. It then proceeds to tell me to turn around at every street and the streets are no where near where I am. Anyone seen this before?
Thank you!