Is External Hard Drive Necessary for Live TV?

Try something like this:

Or you could make an extended network like this to cover the whole house with strong LAN.

Well, then testing on another device might be the best. If you can test from a wired computer, or a phone/tablet that is closer to your primary WiFi router. I am suspecting something in the WiFi is causing the issue. It could be the booster. If that is the case, then the powerline adapter “FlyingDiver” suggested might help.