I love my Audi A6. This is my 2nd Audi and I will continue to own Audi's. But right now I am having a problem with my radio not working when the outside temp. is over 88 degrees. I can park in my garage and once the car cools down the radio works. But once I take it out in the sun and it heats up it quits working. Audi is telling me it is the window tint which I have had on the car for two years and the problem just started. Any help?