Many microwave oven users open the door while it is working. The microwave oven is designed to stop radiating when the door is opened. This is done using two switches (for safety reasons) in series to stop the radiation. But if both switches fail to work the result will be the radiation to exposed to us with the risk to blind us. The switches are more possible to fail if they are used often. This is done every time that we open the door without waiting to stop first. If we want to stop the microwave oven we have to stop it first and then open the door.