My Belling Cooker Executive, seem to have a shortage on one of the rings, every time I turned it on it cut the rest of power off. I had change the ring and put a new one on it, but the same thing seem to be happening. The rest of the rings work fine, it is not an old cooker, so I wonder if it is some sort of build up of oil or sediment on the contacts that causing the problem, although they do look clean. Can some one out there give me some guidanc's please Thanks.