Thanks for explaining @Lummie. I've checked things out on my end and tried to start the MotoGP episode. As soon as the epsiode starts I do have sound, but the commentary is in Dutch. I suspect you would like to start the episode with English commentary so I've tried switching to English by pressing the three dots on the remote and select ''audio'' and ''English''. The result? No sound or commentary. After switching back to Dutch audio, the sound and commentary was back.
This can unfortunately be explained. During a broadcast we depend on the audio track that is sent along with this. If the English audio track is sent with Replay, you can activate this and you will have sound. If the English audio track is not sent along, you can turn it on, but unfortunately it will not work.