Oh wow, well it’s not your server then, and I refuse to believe UTP makes any difference in a normal house.
Just as a fun experiment: do you have the same issues if you use your tablet/phone on the same WiFi?
When you look in the dashboard during playback; does it need to transcode or is it Direct Playing?
I thought you meant unshielded twisted pair as UTP, which would make no difference.
I assume you are talking about something else?
Did you get to have a look at my other two questions?