That's rather vague information. Is it a Roku TV? If so, what brand? Roku does not make the TVs, they only supply the smart TV operating system. Does it happen only with specific channels, or multiple?
If it's not a Roku TV, then you're asking on the wrong forum.
Dan Roku Stick (3600), Ultra (4640), Ultra (4670), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.