I have several Kasa Devices that are dropping off my Wifi almost daily, and have not been able to remain connected for more than 48 hours:
But I also have the following Kasa devices that do not have any issues remaining connected:
I use a Netgear WAX630 Access Point with the following settings for the SSID these devices are attached to:
Broadcasting on both 2.4GHz and 5GHz (changing to only broadcast on 2.4 is not a fix, as this is not the problem as all these devices worked just fine for more than 2 years on a Nest Wifi system that broadcast the same SSID on both bands)
Security is WPA2 Personal
802.11w (PMF) is Disabled
Band Steering is disabled
802.11r (Fast Roaming) is disabled
All radios are in 802.11ax mode
2.4GHz radio is fixed to Channel 1
The error I receive in my AP logs for each device is that it could not obtain an IP address, which is impossible because they are ALL set to have DHCP reservations.
I have done everything short of factory resetting the problematic devices, which should not need to be done if the issue is happening to all devices of the same model; maybe if it was one or two devices of the same model not working while others did, I could see performing a factory reset.