Hi I am new to Audi's. I bought my 2010 A6 last july. Its been great. However yesterday when i went to use the Nav a message came across saying "Navigation is blocked" Then the next time i started my car the radio wouldn't come on. And none of the lights that light up the controls were on either. Now today when i turned it on the radio worked. But the Nav still has that error message. What do I need to do?