And exactly which channel/app are you referring to? No one can offer any suggestions without knowing some details. Depending on the channel, it might not be anything Roku can control.
That channel was not created or supported by Roku. You need to contact the developer, which I would guess is the Discovery network. I have no idea how to contact them, but on Monday one of the forum admins can probably offer a suggestion.
Thank you both for responding with the channels that you experienced the problem with. The forum admin would have asked you for that on Monday, so I just saved him the time. I think with YouTube TV there might be a known issue, but @RokuTannerD or @RokuDanny-R should be able to answer better Monday.
I can tell you Fox jumped ship from Sling this past week and took its sub channels also temporarily. Fox want more money from streamers and that may be the problem.
Also the buffering "circle" problem is better if you set Roku settings to 720 resolution.