Welcome to the Roku Community!
Does the issue only occur on CBS or across other channels installed on your Roku device?
Have you tried removing CBS and then re-installing it again? If not, we suggest starting there. To ensure the process is successful, make sure to restart your device before adding the channel back in. We recommend doing this through the Settings menu by navigating to Settings > System > Power (If there is no Power submenu, proceed to the next step.) > System restart.
For detailed instructions, refer to this Support link for more information: How to resolve a channel playback issue | Official Roku Support.
Let us know if there's any difference after.