Currently I use wifi but am wondering if I can use old cable tv connection between modem and android instead of wifi. What is needed to do this, if it can be done.

You need an ethernet cable between buzz and modem 

Can't get at wiring to change as all walls, ceiling etc are finished.

You need an ethernet cable between buzz and modem

 

You could look up powerline adapters 

What's the issue with your wifi?

Picture freezes momentarily on higher number channels.

Higher number channels?

That makes no sense. 

3 hours ago, Ron Zsombor said:

Picture freezes momentarily on higher number channels.

I think is the server problem,or try to change the player 

You could install speedtest or some program like that to test your internet speed on wifi, but the powerline solution is also a viable solution.

use analti to test wifi