@Leo1664 

Plug's remote control is not stable enough, it cause you can't control the plug with Alexa sometimes. How often the issue happens? When and where did you buy the plug? Does it work fine before? 

When the issue happens, do you have internet if you connect to the router's wifi? 

You can try to change the router's DNS to 8.8.8.8/8.8.4.4 or channel to 1,6,11, change the channel width to 20Mhz, make sure the plug's signal strength is good enough, you can go to the Device info page to check on the app.

@Stella.Q The issue happens preety much everytime I want to use them, I have had the plugs for a while and one was purchased Dec 2017 and the other Feb 2018 and they were purchaed from Argos and Currys.

I have never had an issue with them until earlier this year and just assumed there was an issue with the Alexa skill and just left it thinking it would sort itself out or a fix would be released, but this was a few months ago and still not working correctly.

I've been using with Alexa since purchasing back in 2017 without issue.

My Internet connection is stable and I have a good connection and good wireless coverage. The plugs always respond to Kasa but not to Alexa.

I am with Virgin Media and have their Super hub 3 which doesn't allow DNS to be changed. I am however not using the Super hub for wireless, and wireless is through a Meraki MR33 Acess Point in Bridge Mode and I will make the necessary changes for DNS and chanels in that and re-test and post back.