I’ve found the KP115 to be VERY reliable … and the Wemo Insight plugs to be very UNreliable.
I had noted some general random disconnections of random devices after adding ~a dozen or so devices on the network (bring the total between 50-60 IP addresses … with all the “known” devices having ‘fixed’ IP addresses assigned to their MAC addresses in the DHCP server). The random disconnects were not limited to WiFi devices, either, which led me to investigate the DHCP server more critically.
Sidebar on the network: TP-Link router (router/DHCP server/Firewall only, no WiFi), connected to switches. Deco X60 & X20 mesh running in AccessPoint mode, with 6 of the 7 nodes hardwired to the switches.
After some reading on the TP-Link forums, I decided to replace the TP-link router with a Ubiquity EdgeRouter-4 … and so far the random disconnects have disappeared. The EdgeRouter-4 handles much higher traffic peaks; my reading of the TP-Link issues was that its DHCP software was not 100% solid.
The jury is still out on the Deco mesh; I haven’t had enough time to judge whether the router replacement has ‘fixed’ all the WiFi issues or not.
None of that, however, really directly relates to the Sense limitations in having more “ground truth” reporting devices than the current Sense device can reliably handle (~20 max).