Error message: problem loading video

through ROKU

Another user (mygreensocks) suggested this procedure from Roku Support staff, which reportedly helped several users:

1. Remove the Apple TV app,
2. Shut off and unplug the TV (or streaming device),
3. Wait 30 seconds,
4. Plug the TV (or streaming device) back in,
5. Reload the Apple TV app.

Else try the Network Connection Reset, as mentioned by user Jarieta:

1. Roku: Home﹥Settings﹥System﹥Advanced System Settings﹥Network Connection Reset

If the issue persists after that, then please contact the Apple Support staff for further assistance.

Had the same issue.

Disabling IPv6 (which you can do in System Setting/Network on the Mac, but must do at router level for the Apple TV, and probably on other devices such as smart TVs) solved it.

Connecting through a VPN (which happened to prioritize IPv4 over IPv6) or connecting to my neighbors' WIFI (with their agreement, their network is IPv4 only) also solved it.

Apple system status page says everything is OK, on Apple - Support - System Status

Please send feedback to Apple on Product Feedback - Apple so they get aware of the problem.