@thewatcher Thanks for posting this.  My power strip was behind my desk and the clicking sound was driving me crazy.  Thanks to your video, I was able to identy what was clicking.  There was nothing plugged into it, but it was still clickingand  turning off/on power outlets.  It was also a little warm, despite nothing drawing power from it.  I ended up removing it and throwing it out.

My KP-125 clicked itself to death 1 year after purchase.  It was the only one I had connected 24/7.

I was monitoring the furnace fan power usage controlled by the smart thermostat.  Fortunately it didn't blow it up.

  @thewatcher 

my faulty smart plug was managing a Heatmiser control box which in turn managed multiple heating zones ....

when it failed the Heatmiser box failed too 

I suspect the smart plug took out the Heatmiser 

whole system had to be replaced / upgraded as Heatmiser was obsolete .... very costly 

all smart plugs went in the bin 

  @AlexKalopsia Same, several of my HS110s have also died in the past six months. I had them longer than the KP115s but they're still within 4-5 years.

HS110 dead with the same issue reported by anyone else. Sad, I won't buy TP-Link plugs in the future.

  @thewatcher Thought I would add this for seach purposes.  I am in the US and model is HS103.  Same issue.  This is the second one I have encountered with this issue out of 6.  Will probably start replacing the others. 

  @JonHM Thats horrendous.

  @JonHM  Ah that sucks, ive not put any of my smart plugs onto anything that was sensative or costly, not becasue what id read about them, just becasue i didnt trust them, but i suppoe i havnt got anything expensive that would benefit from being  on a smart plug of that nature. Did the plug fail then and thats when the pcb went?

  @cbc001 sadly one of my 4 smart plugs was controlling a Heatmiser heating control system .... I suspect its failure was responsible for

frying the PCB .... £1k cost of replacement!