@Tony I do not have a setting for free roaming, only fast roaming which is disabled. I will give your idea about guest network a try and let you know. I assume that only the Kasa devices should be...

I have several Smart Plugs and Smart Switches (2 way, 3 way & Dimmers). I recently installed a Deco M3 mesh system. Since then the Kasa App on my iPhones & iPads often lose connection with a Smart...