I’ll go along with the hub comment. I would also say that that speed is not the problem either, I have had issues on 30mbps and still get them on 65mbps. As I’ve said before I believe data packets are being sent faster than the processor in the youview box can reassemble them. Strangely I have been watching BT Sport tonight whilst recording another program which is usually a recipe for sound problems but there have been very few.
I have had this problem for a couple of years or more, and have changed boxes, HDMI leads etc for other reasons, not just this and it is still going on, I've just been putting up with it. Watching Spurs v Southampton at the moment. To be clear this is hiccupping sound on BT Sport channels only, not Freeview channels. From reading these forums it is a widespread problem, with no clear solution. I'm not sure that solving the problem for individuals is the answer, because it seems to be a system issue. What does seem to help, as suggested before, is pausing the stream for 10 secs or so, which would indicate a problem with the BT stream itself. Was quite bad before I tried this, better at the moment.