Getting jerky/broken/stuttering play back but only when watching Eurosport via BT Broardband through the BT TV box. Every other channel is fine! I don't have the HD upgrade so it's not even working in the standard mode for me. I work at BSB and the only way to catch up is to watch when I get home, very disappointing.
A couple of observations ..
You posted on a 2 year old thread about the BT Sport App on some mobile devices. So I will separate it out into its own thread.
However your issue seems to be when using the BT TV service on a BT TV (Youview) box. The BT TV box does not have the BT Sport app rather it has linear channels eg Eurosport 1 (412) and Eurosport 2 (413) which are delivered by multicast plus there is the BT Player app which has some Eurosport.
Having BT Sport which now includes the Eurosport channels on BT TV would normally give you access to both the BT TV app which has the live channels , some Eurosport catchup plus the Discovery plus App which has the live Eurosport channels , some extra live streams and a more comprehensive catchup and replay. So whilst you pursue the issues with the BT TV channels you do have alternative sources of the content.