Restart the Roku device from Settings > System > Power > System restart
Unplug the Roku device from power for 30 seconds, then plug it back in
Remove the affected channel from the Roku home screen
Restart the Roku device again
Reinstall the channel from the Roku Channel Store
Clear the cache by pressing Home 5 times, Up 1 time, Rewind 2 times, and Fast Forward 2 times
Check for Roku updates in Settings > System > System update
Restart your router if streaming issues continue