My view is that there are some defects in the Kasa WiFi software stack that only manifest themselves when being polled / stressed very regularly, as the Sense monitor does (polling all plugs every 2 seconds). Some of the Kasa issues correct themselves, but others eventually require a reboot of the router. What’s also interesting is that the issues sometimes show up across sets of Kasa devices. I have Home Assistant watching 7 of my Kasa smartplugs and the associated data being picked up by Sense from those smarplugs. The first bar in the sequence is my network’s view on the each Kasa plug, while the second is Sense’s view. You’ll notice that there is some kind of Sense outage on 3 of the plugs at 2:55 AM or so. That sequence of 3 “Homes” in a row, reveals brief gaps in ALL the Kasa plugs’ connections with my network.
More info on some of the issues that affect Kasa plugs.