Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
First, what model Roku do you have? The model number please. Roku has a bad habit of reusing the same name on different devices.
The first thing to try when a single channel is misbehaving is to remove the channel, reboot the Roku (critical step, do not skip it), and then add the channel back in.
I stress again, you must reboot the Roku before adding the channel back. Only a reboot actually removes the channel completely.
Dan Roku Stick (3600), Ultra (4640), Ultra (4670), Ultra (4800), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.