I had a similar problem the first time I set up the smart plugs. I wound up deleting everything from Kasa, hard-resetting all the plugs, re-booting my router, and carefully adding everything back....

Anthony: I had a HS100 that went off-line randomly. I wound up swapping it for another smartplug in a different location. The replacement plug also went off-line. I then swapped it with another plug...