YouTube is working fine here. What model Roku are you using (model number, not just the name)? Does any other channel have connection issues? How are you connecting to the Internet with the Roku: WiFi or Ethernet?
Dan
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution."
If you appreciate my answer, maybe give me a Kudo.
I am not a Roku employee, just another user.