Thanks for the post.
We'd like to gather more information about the issue you're running into. Does the issue only occur on a specific channel or all channels on your Roku device? What was the error message when attempted to stream the channel?
Have you tried 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>System restart. Once your player starts up again, add the channel back once more.
With more information, we will be able to assist you further.