Thanks for the post. I'm sorry to hear about the experience and I will do my best to assist you.
Try removing the channel that you are experiencing the issue with from the Roku home screen. Then, disconnect your device from power for a minute. Plug it back in, then try to add the channel back once more and see if this clears up the issue.
We also would recommend checking for a channel update by going to the channel on the Home screen and pressing the * and checking for a channel update.