When the kettle boils, the light goes out for a while, it's dark at night, and at the end the water boils, but time gets longer
The temperature control device (such as drawing) has bad contact with the copper contact piece. Because of the long time use, the raw copper sheet has been deformed upwards, and the copper contact plate has been adjusted downward so that it can be repaired in place.
Check the line of electric kettle, the power switch is the key (aging lead to poor contact), electric power interface (pot aging lead to poor contact) there is a socket is reliable, can use the new socket to try, if the home switch finally has poor contact than the more common is the fire burnt taste and recommended by professional personnel to repair, to avoid bad things happen.
