After working for years, one of my Kasa switches started to fast blink green. The white circle light is also fast blinking. The KS200 switch doesn't manually operate the light. I have a deco x55 mesh...

Sorry, no need to respond as my questions were answered further in the thread. Thank you!

Sorry, I see that you did replace both three ways.

@board4mic thank you for the diagram. Did you replace both 3-ways with Kasa 3-way switches or just one of them? Did the system know if the lights were on or off? Did the scheduling function work?...