The newly bought beautiful electric kettle suddenly stopped ringing in the process of boiling water. After a few seconds, it continued to boil water until it was turned on and off. Is there a quality problem? This is because the electric heating tube is aging and has poor contact. I have used several electric kettles, all of which are like this. When I first bought it, I always heard noise as soon as I plugged in the power supply and turned on the switch. Until the water boils. Then after a while, you can hear the sound of the switch jumping. However, after one or two years of use, the electric heating tube has poor contact because of aging. So when boiling water, as soon as you plug in the voltage switch, you will hear the sound of boiling water. At first, it will stop intermittently, and soon you will hear the sound of boiling water until it boils. Slowly, the interval is getting longer and longer. Until the heating tube is completely out of contact. You will never hear the sound of boiling water again. At this time, the electric kettle was completely scrapped. It's not cost-effective to take care of it. We can only buy new ones.