Hi Sj68,
Thanks for keeping us posted regarding the behavior you are seeing with the abovementioned channels, and we're very sorry to hear about the trouble.
We recommend performing the steps below to resolve the issue.
1. Remove the channel by highlighting it and pressing the Star (*) button
2. Restart the Roku device from Settings > System > System Restart
3. Install the channel again. Select Channel Store > Search for the channel > Click Add channel
For more help, you can visit this link: How to resolve a channel playback issue.
After performing these troubleshooting steps, kindly check if the issue persists.
All the best,
Janadee