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If this channel is one for which you have a paid subscription through Roku, there will be a "Manage subscription" option instead of a "Remove channel" option. You can click this and follow the prompts to cancel your subscription and prevent any more payments, but your subscription and channel access will continue until your subscription period runs out. Due to a programming decision by Roku, you will not be able to remove the channel app via the Roku interface until the subscription period runs out.
Instead, try removing the channel via the official Roku remote app on an Android/iOS phone/tablet.
At the bottom of the app's Home screen, click "Devices" and connect to one of them if not connected already. Click on "Search" at the bottom of the page and locate your channel. Click AND HOLD for a few seconds on the channel to be presented with options to Launch the channel on your Roku, or to Remove the channel. (A quick click will instead bring up the remote control functions.)
This will remove the channel from your Roku account and allow you to reinstall it in the hope of fixing your current problem, but it will NOT cancel the paid subscription to that channel if there is one.
