The centre light has gone off on the hub, and I can't control the lights. How do I fix it?

Firstly, try unplugging and reconnecting the hub to force it to restart. In many cases the hub will simply have lost its internet connection due to a brief internet outage, and sometimes it cannot automatically recover it. If this fails and the centre light does not light again when the hub restarts, there may be an issue with your internet connection, or a global internet issue affecting the cloud servers. As a last resort, follow the instructions to re-configure the Wi-Fi settings elsewhere in this FAQ. If this is successful you should not lose any of your settings, scenes or schedules as the hub will remember them when it re-establishes the connection to your account.