Installed the app last night and the lip sync is way out on live broadcasts and on-demand content too. I have the app on an iPad and on my Samsung smart TV and it does not happen on either of those. It only happens on the Amazon Firestick 4k which I'd rather play the content of. I've uninstalled and reinstalled the app on the Firestick and no improvement.
Any ideas folks?
Thanks Darren. I have a Sky Q box and Sonos sound bar connected to the TV already and no sound sync issues. It's only on the Firestick and it's only on the BT Sport app. There are no sound sync issues using things like Amazon Prime Video or iPlayer on the Firestick. It's only the BT Sport app. And the delay is not marginal, it's a couple of seconds. It's unwatchable 😞