I have 3x KS200 Kasa switches that all disconnect from the WiFi everyday, showing a red LED. They reconnect right away after hitting the reset button. All 3 came from the same multipack. 2 are on one electrical circuit, 1 is on a total different circuit. 
 

I have TP Link Deco wifi and even moved the access point within 6 feet of 2 of the switches and they still continue to drop. Signal strength is -35 dBm and -38dBm. 
 

I've tried statically assigning the IP address to all 3 switches which has not helped and also tried various configurations with enabling and disabling features like Mesh technology, High Priority, Auto Band, static Deco connection etc. 

Have several Wemo devices I was planning to migrate to Kasa but I've now decided to think twice about that as these are more unreliable than the Wemos.