@vjbutt 

Yep, spot on. Exactly that cap has gone on mine today. Not sure if I have the skill or the inclination to try to fix it...

I have 10 of them. in the last month i've lost 2 of them. They can't be trusted. 

Oddly the 10 £7 zigbee plugs from china have not failed. 

I thought i could trust the TP-Link ones more but i've lost that trust and will look at replacing them all.

https://www.youtube.com/shorts/hN_3e4Ml3vg

After my third KP115 malfunctioned with the classical on-off periodic sequence reported in this thread, I decided to open one and see if these could be repaired.  It turns out that in all three plugs, the culprit was a 470uF 10V capacitor, marked (3) below.  You can see the tell-tale sign of a failed capacitor by its bulge.  I have now replaced this capacitor with a 16V one because I didn't have 10V ones.  It is slightly bigger, but will fit just fine.  To replace this capacitor you need to open the plug up, which is not a straight forward task, since the plug's case is held in place by clips.  I have marked their position with arrows below.  You need to insert a small flat screwdriver under one clip and then prise it open.  Then insert a flat plastic card in the opened gap and make your way to the other clips.  Once you get the case opened, you need to desolder the two mains connectors marked by (1) and (2) below.  Once you free these, you can then remove the PCB so that you may access capactior (3).  Make sure that you take note of the polarity of the capacitor that you remove.  The negative terminal is towards the edge of the PCB.  Once you replace this capacitor, simply resolder back the PCB and click the case back on.  This should solve the problem, at least it did in all three plugs that malfunctioned in my case.   Hope this helps.

 I have six HS110s for over 3 years now. Because their form factor is quite bulky and often obscured the outlet next to them, I started buying KP115s when they became available, eventually buying six of them about two years ago. About half a year ago, the KP115 monitoring my fridge starting clicking off randomly. Unplugging and replugging fixed it but not long after it started clicking on and off in quick succession. Dead.

This morning I walk into my living room to the same clicking sound. I recognised it immediately, and yep, the one for my rear speakers is gone.

While I have a smaller sample size, my 1 in 3 failure rate is consistent with others in this thread. It's worth noting that none of my HS110s have failed and I've had them for even longer, which leads me to believe there's a flaw in the parts or design of the KP115 that allows them to be much more compact.

The one for my fridge was pretty much only monitoring energy usage. Since it's a fridge it doesn't really get turned on or off. The one for my rear speakers turn off when no one is home.

I replaced the fridge one with a different product but had been considering getting more Tapo ones now that Kasa is discontinued. Guess not. They look like exactly the same product with a different firmware, so I wouldn't be surprised if they had the same failure rate.

I have exactly the same problem with P110.  One failed, killing my internet/router while we were watching TV. Another one failed less than a week later (fridge out).  Now today, another failed (click-click-click).  All three were from the same batch, under six months old, and are 6-12 months older than a bunch in the house that are still working fine.

  @heavydawson That tracks with my experience.Out of 18 plugs (KP105 & KP115) that I bought in the past 3 years, 5 have died, so 28%.

They all die in the same way - by getting into a loop of power cycling quickly and repeatedly. It's a pretty bad way to fail: the last one died when connected to my TV yesterday, turning it on and off (as well as my entire home cinema, thanks to CEC!) every second for I don't know how long, since I wasn't in the room until the evening. Might have been hours.

The biggest issue isn't that they fail, it's how they fail. They should just die and stay dead, that would be better. This, on the other hand, is worrying, so I'm not interested in an RMA with what sounds like a design flaw, and I'm binning them all now.

Two of my HS300 powerstrips started doing this.  First noticed last Thursday night.  Was there a recent firmware update that would have changed this?

I am experiencing same problem with two out of four KP115 smart plugs.  It seems like a manufacturing problem.  Shame really.  As already mentioned in this thread, this could result in significant danger and damage, depending on what is connected to these plugs.  Tp-link should seriously consider a recall before somebody sues them for substantial damages.

  @thewatcher 

Tapo P110 .... WiFI plug has commenced continuous clicking ...... I believe a power cut may have triggered this .... Tried pressing side button continuously and as one off to re-set but no joy .... Any solution to this or is it the BIN?