Hi Bakerkevjb,
Thanks for your post and apologies to hear you are having an issue with pixelation when it comes to watching BT Sports in HD.
Just out of interest, do you get the same issue when switching to BT Sports SD?
I've had a look at your TiVo® stats and everything is looking good in terms of signal levels. Is it only on BT Sports that you have this issue or with other HD channels too?
Did you also try rebooting the box to see if this helps?
Come back and let me know.