Milex

I bought the Milex Air Fryer, Microwave and Convectional oven 2 years ago. Yesterday I cooked a pizza on Air Fryer mode. About 10 seconds before it was done I heard a loud bang. The microwave plate broke into pieces the size of big cake slices. I don't understand this because the plate is supposed to handle high temperature as it works for the oven as well. Now I have to buy a new one.