The problem is intermittent, but it has been narrowed down to happen when the car is driving with the windscreen wiper on, rain or not.

There is an amber light to warn of a fault with the lights, and although the lights are OK, this light illuminates after about 6 minutes of driving with the wipers on. The car is 6 months old, and it had been back to the dealer 4 times, but still not fixed.

Two codes were found:
01758 006 “Lamps for brake lights Short circuit to B+ Intermittent”
and
03583 006 “Windshield wiper motor activation (1/2 speed) Short circuit to B+ Intermittent”