Try removing the channel from the Roku home screen by navigating to the channel tile, pressing the * key on your remote, and choosing 'Remove channel'. Then restart your device from Settings>System>System restart. Once your player starts up again, add the channel back once more.
Please try doing this and see if it helps with what you're experiencing.
Does the issue only occur on OANN or across other channels installed on your Roku device?
If you haven't tried yet, you can remove the affected channel then re-install it. To ensure the process is successful, make sure to restart your device before adding the channel back in. We would recommend doing this from the Settings menu by navigating to Settings > System > System restart > Restart.