I’ve had the same problem with my KP115’s (now 5 of them). I wrote a thread about it, if you want to read some details. My experience is exactly like @Offthewall in that they all go out at the same time, they stay out until you unplug/replug them, and yet the Kasa app never has any trouble reading them. My LAN is a TP-Link Deco M9+ router (mesh system), sitting behind an AT&T fiber cable modem. I have found that rebooting the router will also bring them back in Sense.
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