I have a 1080p tv, why do I have to set it up in 1080i everytime I turn on the cable box? It is defaultsback to 720p, and does not keep the 1080 setting the next time I turn it on. How do I get it to keep the default to 1080 without having to do it manually everytime I turn on the TV. My box is a Motorola QIP6416-2 HD/DVR.