Thanks for the post.
Channels on Roku are developed and maintained by the developer themselves. In your case, we suggest reaching out to their Support team directly to report the issue and for further help. There's likely an issue within that specific channel that needs to be addressed with an update from the developer.
You can contact them here: https://support.watch.nba.com/hc/en-us
We appreciate your understanding.
All the best,
Roku Forum Moderator