Well, I change my Wi-Fi to standard Belkin (no 5 GHz). The activation appears to start working then I get an error code to forget Wi-Fi settings. So I forget Radio and try again. Fails and fails. I've unplugged the unit, then pressed the buttons until the ring and one light are blue, release and wait until the second light blinks. Then I try activation again. This has never happened before. Usually if Wi-Fi goes down, eventually Rachio will come back online without a problem. So sorry to bring you problems.