In some cases, removing the affected channel and then reinstalling it helps. To ensure the process is successful, restart your device before adding the channel back in. We would recommend doing this from the Settings menu by navigating to Settings > System > Power (If you do not see a Power submenu, skip to the next step.) > System restart.
Moreover, please be advised that if you are removing a subscription channel billed to your Roku account, you must cancel the subscription first before you see the Remove channel option. You won't be charged again for the channel if you resubscribe within the membership's validity date.