i crashed my car a couple of months ago and one of the replaced components was the driver's side hadlight complete unit bulb ballast starter etc.
Sometimes the new headlight fails to kick in, the remedy to this is to turn the main beam off and back on again, it ALWAYS works 2nd time.
some days it will happen 5 times others it wont happen at all.
So I sent it back to the garage that repaired it who then sent it to Audi, who replaced the headlight with another brand new one.
I got it back tonight and 3 or 4th time I turned headlights on same problem again.
It does come with a DIS bulb failure warning as well.
starting to lose the will to live with this now