I am having sound problems with BT Sport Ultimate. If I try the built in speakers in my 2016 Samsung TV I don't get any issues, but I usually use a Sonos system (soundbar, sub, two surround satellites). The Sonos set up works perfectly for all other channels, all of the time.
When I go to Ch 433 the picture is fine but the sound breaks up badly, and always has done, so this isn't a new problem.
Given it all works fine through the TV speakers, there's clearly something wrong with the Sonos/Config - maybe it is sound settings, maybe the hardware/wires have a problem.