Thanks for bringing this to our attention.
In some cases, removing the affected channel and then reinstalling 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 > Power (If you do not see a Power submenu, skip to the next step.) > System restart.
For detailed instructions, refer to this Support link: How do I resolve channel playback issues?
Let us know how it goes!
All the best,
Roku Forum Moderator