the range it s less than a year ago from Lowes, ran a self cleaning cycle on the upper oven, ever since it pops when it’s heat up and pops again when it’s cool down . Technician came out twice said nothing that they can fix and the manufacturer said it s normal, call oil canning and nothing they can do about it. So I was going to live with the pops but as the months go by, I am getting more and more annoy by it and it still scare me every time it pops. Am I just out of luck?