Have been trying to cook a meat loaf for four hours. Thought it was done the first time but the oven went out while cooking. The pilot light lights, I wait for the the entire flame to come on, adjust the temperature and close the door. It cooks a bit then I hear the flame popping out. I have rest it several times. This is a new oven and the RV is only three weeks old. Now I have a meat loaf that I can not cook and will have to throw out. Any suggestions.