HS200 lights always on, replaced with new one and same problem!
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Hello everyone. I have 5 Kasa smart switches in my house and have had no problems for 13 months now. All of a sudden our kitchen counter lights would not turn off from the app, from google home or manually pressing the button. I reset the switch (both types of reset) and figured the switch had gone bad. I ordered a replacement HS200 and swapped them today and now have the exact same problem with a brand new switch!
To make this even more curious, the counter lights DO eventually turn off late into the light, and back on at some point during the day, although we can't figure out a specific time or cause. I am confident this is/was wired correctly and can't for the life of me figure out what is going on here 
Appreciate any help from the community while I sort out how to open a support ticket with TP-Link.
Regards,
Jim
@Carl thank you for your response! Yes all three wires are connected properly (we have 6 of them in the house). The really funny thing is that I replaced the switch with a new one, and have had the SAME behavior, but less consistently. Sometimes it works, sometimes it doesn't 
I am starting to think this is a software issue, meaning a possible conflict with the Kasa account, Kasa app and Google Home? We recently switched our Google Home profile to a shared personal Google account (G-Suite accounts can not "share" a home) and worried there is some sort of conflict between the different accounts. The other thing we noticed is that the switch/device becomes unresponsive at certain times, such as after our front deck lights turn on (scheduled at "Sunset" in the Kasa app). It is the strangest thing!
@Carl thank you SO MUCH for your suggestions, and sorry I completely dropped the ball on this. For a short while we had no problems, and then NOW the switch (the newer one I replaced the original with) which controls all our kitchen counter lights will turn OFF at 7:46pm every night! I think I have gremlins in my system, it is driving me crazy trying to figure it out. Also another older smart plug (also TP-Link) keeps randomly turning on in my wife's she shed. So I suspect it is getting some turn off signal from a connected app/service/device and wish I could see a LOG of requests being sent to the switch and track down the source.
I have completely unlinked ALL accounts (and all 20 switches and plugs) from Google Home and painstakingly added them back and it is still happening.
Here is a screenshot of the device. Latest firmware and FULL wifi signal. Our third Google Wifi (not the newer NEST Wifi) is in out kitchen and about 8 feet from the switch.
