You may need to force close the CBS All Access app. 

On your iPhone/iPad:
1. From the Home screen, quickly press the Home button twice.
2. A list of running applications should now show on the screen.
3. Simply swipe up on the app to close each apps background task (this will also save battery life on your mobile device).

On your iPhone X:
1. From the Home screen, swipe up and pause. 
2. Firmly touch and hold the app, then tap the red circle in the upper left corner of the app screen. You can also swipe up to close the app as soon as you see the red circle.