Why is my Live TV stuttering and freezing?

Hello,

I have the HDHomeRun Prime and have it wired directly to my router. When I click on Live TV on my plex app through Amazon Fire Stick, it will freeze, stutter, or even sometimes say that it can’t be reached. I can play movies and other tv shows that are my on my server just fine, but when it comes to TV, it becomes a big issue. This would also translate to anything that I would record as well. If I use the HDHomeRun App, it works perfectly fine. Please advise. Thank you.