Thanks for the post.
In some cases, removing the affected channel then re-installing it may help. To ensure the process is successful, make sure to restart your device before adding the channel back in. We would recommend doing this from the Settings menu by navigating to Settings > System > System restart > Restart.
For detailed instructions, refer to this Support link: How do I resolve channel playback issues?
Let us know if there's any difference after.
All the best,
Roku Forum Moderator