This is a new one for me, and it probably not a now tv app fault but thought I would put it out there incase anyone else is having the same problem of knows a fix, when watching F1 on catchup or live tv, when the ads come on the sound stops, so I have to press the back button on the apple control and then go back into F1 and the sound is back again, now the weird thing is if I follow those steps in the middle of the ads the sound comes back on but goes again when F1 starts again, none of this happens if I watch F1 on the app through my Samsung tv app. very strange.