That sounds suspiciously like pixellation which is often caused by a signal fault. Do you get any issues with OnDemand or streaming?
One box reboot is always a good idea with these things if you've not already. Also if possible, check Quest HD - it's on the same broadcast cluster as Eurosport 2HD and would be similarly affected by signal issues.
Which BT Sport channels in particular are affected - there's 4 of them.
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Sorry to hear that you are experiencing picture and sound issues with certain channels on your TV, I understand how frustrating this must be for you.
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