Our WiFi went out the other night and we have been unable to connect back into any network since then. We have tried simply restarting both the router and the Roku, clearing the network memory, connecting to a different network (didn’t work), and a factory reset. The signal strength was excellent and all other devices, including another Roku, works on our network. We are at a loss here.
Furthermore, if the affected device is either a Roku Express or Roku Premiere, please note that they are only compatible with wireless b/g/n networks on the 2.4 GHz spectrum. Ensure that your router is broadcasting a 2.4GHz Wi-Fi network for the device to connect to. You can check your device model by navigating to Settings > System > About.
You can also try configuring your router and use wireless channels 1, 6, or 11 which are the preferred channels in North America. Each time you change the wireless channel, you will likely need to apply/save changes before you are prompted to restart the router.