My Electrolux built-in oven keeps cutting out. The model number is EOB5630W. It gets up to temperature (as indicated by the red light going out) and it's OK for about 20 minutes but then cuts out - ie the light inside the oven goes out and the fan stops. The power light stays on. If I open the oven door, the heat that comes out feels much too hot for the temperature it's supposed to be. After about another 20 mins, the fan and the light inside the oven come back on. The grill within the oven cuts out after a much shorter time - about 5-10 mins until it cuts out. Can anyone help please?