@Wayne-TP Its caused by capacitor failure in the plug see KP115 Smart Plug suddenly constant clicking on and off see video inside - Smart Home Community (tp-link.com)

@Wayne-TP It is faulty Not necessarily linke to what was plugged in see KP115 Smart Plug suddenly constant clicking on and off see video inside - Smart Home Community (tp-link.com)

@Wayne-TP See KP115 Smart Plug suddenly constant clicking on and off see video inside - Smart Home Community (tp-link.com)

@Lethalas beware using cheap capacitors, these are obviously stressed components. I didn't have 470u but had some 100u solid electrolyte automobile grade. High ripple current and will not dry out.

@thewatcher so far had only one of 6 fail with just this problem. As noted by some one earlier it is a capacitor failing on the dc low voltage power supply of the plug circuit. I have opened up all...