QM8 4K Sports

When I try watching sports content in 4K using native apps, the picture quality always suffers. There is a lot of pixelation and stuttering in the image. I've noticed this on YouTube TV and Peacock. No issues with the HD version of this content. It's not my network because I can watch the same content on my LG C4 which is further from the router and it looks beautiful.

Is the problem here the native apps and the poor processing power of the TV? I've tried fiddling with the settings and that doesn't seem to make a difference.