Thanks for reaching out regarding the playback issue you are experiencing with Youtube.
I'd be happy to take a closer look to see how we can help get you up and running.
A few questions here to better understand what you're experiencing:
1. Are you using a Roku TV or a Roku device?
2. Does the issue only occur on a specific channel or all channels on your Roku device?
3. Are you receiving error messages or codes when accessing the channel?
4. What specific troubleshooting steps have you taken so far to try to resolve the issue?
5. Have you tried removing the channel from the Roku home screen by navigating to the channel tile, pressing the * key on your remote and choosing 'Remove channel'. Then restart your device from Settings>System>System restart. Once your player starts up again, add the channel back once more.
With more information, we will be able to assist you further.