Sky Sports issues
I am having similar issues and it is really spoiling my enjoyment of Sky Sports coverage of live football . I looked at my Video output and all other aspects of a potential solution [reboot tivo V6 , cable check and reseat] . I manually scrolled and tested all video outputs and they all were accepted and then selected the automatic settings which settled at 2160p as being the most appropriate for my LG 50UM7600PLB TV .
The Sports package is not cheap and this continual pixelation is really having an impact on my enjoyment. The main channels for Sky's football in my case are 511 Main Event and 512 Premier League both exhibit the issue frequently . Can I please ask your advice in terms of what else I can do
It's usually better to start a new post explaining your issues, than add to someone else's.. it's been done for you here.
Are you reporting a pixellation/picture breakup fault? That's usually a signal issue.
Or is this an issue of picture quality, where an SD picture upscaled to HD or especially UHD, is never going to end well.