Hi,
Don't know if this really helps, but please just follow the logic.
You have three lines active in the box, one good, one average and one poor.
As it stands the box will use any at random if they are all active.
This could mean glitchy viewing even though you have a good line in the box.
If you had priority settings and your good line goes down, you are still
left with a crap service.
Just find another good line and use one line in the box.
Finally, I have never seen anything posted before on this subject,
so i guess they don't exist.