@Tony thanks for your reply. However I cannot enable/disable networks on my router. The 5G and 2.4g are always on, and my Kasa plugs only use the 2.4g. Anything else I can try?

I have four of the same plugs that I've been using for over 6 months with no issues. I have them turn on in the morning and off at night with Alexa commands. Yesterday they all started blinking blue...