We would recommend removing the channel from the Roku home screen by navigating to the channel tile, pressing the * key on your remote, and choosing 'Remove channel'. Then restart your device from Settings>System>Systemrestart. Once your player starts up again, add the channel back once more. To help troubleshoot the issue further, follow this link: How to resolve a channel playback issue
Hope you'll find this information useful. Let us know in case you've still got any questions.