Oven enamel chipping
The only solution I know of for the enamel coming off on these units is replacement of the unit, and since it is 4 years old you are going to have a tough time getting dacor to replace it or even give you a credit towards a new one. I have never actually seen the problem on a Dacor. Does the unit have a hidden lower bake element? If you cannot seee the elemnt its hidden, and you cannot put tin foil on the floor of any unit wiht a hidden bake element, as it will damage the finish. I know this isnt much help, but I work on Dacor products regularly as we are an authorized servicer, and I can't say I've ever seen a finish problem on one. Best bet at this point is to call Dacor and see if they will do anything about it. Good Luck!