Just happened this morning. I opened my ROKU device and found that none of my streaming channels will open. I checked my WiFi and internet connections and they are fine. I can surf my channel titles, but any that I select will not open. Any advice would be appreciated. Thanks.
Even though your Wi-Fi appears to be fine, I suggest you restart everything involved - Roku and gateway/modem/router. Just unplug the power for a few seconds and plug everything back in.