Over some misted up headlights? It is a problem on all marques. I have seen 57 plate 3 series beemers with the same problems. A simple fix can be done to resolve it. I'm surprised the dealer hasn't done it already. It is a problem with modern headlight design
That's not quite true some designs are more subceptable that others but it should not be the "norm" the new AUDI A8 has heaters within the headlight system to dry out the large hdlight area - I have even suggested this to SEAT, but the rework costs would be too high
[ suppose we could all have internal hdlight wipers though!!]