I've been using my Tivo (with no cable box) for about 4 months and all has been great. However, over the past week a large majority of my channels are now scrambled or unavailable. I have Basic Comcast cable and live in center city Philadelphia. Would anyone happen to know if this is a temporary thing with Comcast? Do I need to just hook up the cable box now? (I'd prefer not to as I have no room in my cabinet for it) Thanks.