99 A6 Avant....DTL are the fog lamps....problem is... after a certain period of time after turning the car on they just turn off. I took a rock smack in the middle of one so I thought that was it. Purchased a new one and the problem still occurs......my mechanic thinks it might be something to do with the relay..(a heat thing)...HAS ANYONE ever had this happen??

Thanks Kris!