Thanks for the post.
Have you tried the suggested tips above? If you haven't tried it yet, you can remove the affected channels and re-install them. To ensure the process is successful, 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.
For detailed instructions, refer to this Support link: How do I resolve channel playback issues?
Keep us posted on how it goes!