Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
What Roku model device are you using? What channels are you trying to access? Have you verified that you are connected to your wireless network still? Have you tried removing the channels, restarting your device, then adding the channels back again?