Both the smart light and mobile phone is on the same local network when the problem happens. At first when the problem happened I was still able to ping the smart device when it disconnected from the app on the mobile phone. But as I tested more often I noticed the pings would stop when the problem happened.

Fast Roaming was already off and the Mesh Technology was off for the smart device in the Deco App. I turned off 5G so both the smart device and mobile phone was on 2.4G. The problem continued to occur.

Normally the smart device will come back after a minute or two. But at least once it did not come back after 5 minutes. It was not ping-able. The smart light was on and I couldn’t even turn it off with the physical button on the smart light controller. At this point I decided to do a factory reset and put the smart light and mobile phone on the guest network with only 2.4G enabled as you suggested.

I removed the smart light from the App then held the button in for 10 seconds to initiate a factory reset. I re-added the smart device and connected to the guest network. At this point the smart device appeared to be working correctly. But after about 15 minutes it lost connectivity and the pings stopped. The smart light was on and I couldn’t turn it off with either the mobile app or the physical button on the smart light. I left the smart device alone for 5 minutes but it never came back. I power cycled the smart light and it started working again. After the factory reset and putting in on the guest network with only 2.4G enabled, the device seems to be working better but it is still having disconnects.

Attached is the photos/screenshots you requested along with a diagram of my network. More than half the time the smart light will recover on its own after about a minute. But sometimes I have to power cycle the smart light. Twice it got stuck turned on and it never came back. A power cycle fixed it. I did notice that after a factory reset it does work better (I’ve done that twice) but will eventually degrade.

Thanks,

Jeff

  @Solla-topee Unfortunately I do not have an old router or AP to test with. The smart light strip is registered under my TP Link account and shows it is under warranty. Thanks for all your help.

Jeff

  @Jethro65 

I'd like to add that I have two of these KL400L5 LED light strips. They both act the same as Jeff described above. They lose connection. They reconnect and work for a minute or two and fail again. Many times I come home and the LED strip one of them is on with nobody requesting it to turn on. 

I now have them powered down as they don't work.

Please fix and provide firmware update.

Dennis

I have 5 KL400l5s, EVERY SINGLE ONE of them drops out, I have tried away from the router, close to it, on top of the router, nothing stays consistent. 

REALLY unhappy with these. My entire house has all the switches with TPLink, but these? Miserable.

I have exactly the same issue. Can you please provide a fix?

  @Jethro65 Same problem here! I have all Kasa smart switches and they work flawless. However, these LED light strips are not reliable at all. They constantly disconnect from the network.

  @Jethro65 Was there ever a fix for this?