My wolf range top was purchased less than four years ago. Within a few week we started experiencing 'burner drift' (thats when the burned turns itself to low). At first I though it was a safety thing but its not. Its virtually impossible to regulate the flame and its crazy making. We do a lot of entertaining - often using outside chefs. Now we cannot get anyone to cook here. The promised replacement valves have not materialized. The company is going out of its way to avoid dealing with the problem. I see many other posts regarding this problem with Wolf. What to do other than buy another brand of rangetop?