Thanks for posting in the Roku Community, @lmpsr49.
Are all other streaming channels playing content normally? If yes and the issue is only with the channel alone and specific content, this is a good indication that there is likely an issue within that specific channel that will need to be addressed with an update from the channel publisher. Channels on Roku are created and maintained by each channel publisher. In this case, you'll want to reach out to that channel publisher directly to share your feedback.
We also recommend taking a look at the troubleshooting steps provided by our Support page here: How do I resolve audio playback issues on my Roku ...
Let us know how it goes!