Yes, I get this problem as well. My wife does not like sport so I’m almost never able to watch it live, so it’s Series Link+ to record it on our V6 box in HD to watch later. The V6 box now favours recording from BT Sport Ultimate and I therefore am getting bursts of stuttering audio through any broadcast. Generally speaking, the video is fine, which seems odd as I’d expect video to be more sensitive to broadcast issues.
The issue does seem to be restricted to playback of recorded shows. On the few occasions when I’ve been able to watch live, the sound is fine.