Have you tried removing and reinstalling the channel?
1. Highlight channel on home screen.
2. Press * key and choose Remove channel option.
3. IMPORTANT- DON'T SKIP: From home screen, Settings > System > System restart. This assures no remnant of the old installation remains in the Roku's memory so you get a complete reinstall. It may or may not make a difference, depending on what's causing your problem, but it's worth doing.
4. Reinstall the channel.
5. If channel requires a login, you may need to log in anew.
Note that a reinstalled station gets added to the bottom of the channel grid on the Roku home page.
Roku Streaming Stick +, 3810X, Ser YH0059427035, wifi - Samsung UN55ES6100
Roku Streaming Stick, 3600X, Ser 5S56D8240827, wifi - JVC EM37T