Try 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 and re-authenticate the channel.
Does this clear up the issue you are seeing? Please keep us posted what you find out.
This happens to me every single time I turn the television off. This is ridiculous and there is no fix. This happens to me on every channel I try to view. I turn on the television, navigate to DirectTV, select any channel and "Oops something went wrong". There has to be some sort of fix for this.