It's been a few more days, and I've had no drops since setting up the guest network. Thanks!

@Tony thanks for the suggestion. I switched them over to the guest network this afternoon and so far so good. We'll see if that lasts.

I have 3 HS220 V1 switches installed in my house. They all worked great for months. Within the lats month, however, they periodically no longer show up as active in my kasa app. This might have...