u/Independent-Ad-1921

I have 5 HS220 and 5 ks225 switches. They worked flawlessly for 2 years until July 15. Then all at once every one of them disconnected for no discernible reason. I cannot reconnect them from the kasa or tapo app. Resetting the switch results in momentary connectivity before disconnecting again. My wifi is working fine and is IOT 2.4ghz. Other non-kasa devices work. I have lowered the security level on the router to minimum. I've tried just about every help page or AI suggestion I can find. Anyone experience anything similar?