WQ5PK

Hello all, I recently purchased SH a 2018 Q5 from an Audi dealership. Being the holiday period it's difficult to get it in with them so I thought I would ask here just to see if this is a known fault. My Q5 has a reversing camera on. As I understand it, when put into reverse, washing the rear windscreen should also wash the camera. The issue I have is that the vehicle seems to do this constantly, even when not in reverse. The result is that virtually no windscreen washer fluid goes onto the rear windscreen and instead constantly sprays across the camera. Is there anyway I can stop this? It seems like some sort of software issue to me? TIA W