I have basic cable with a TV Box. My channels 10, 12, 13 have all shrunk and squished the picture. There are two separate televisions in my household, different brands, and both have the same problems - same channels. Everything was fine last week, but this week it's the disappearing screen. Definitely not a TV problem - so what happened between last week and a few days ago? What kind of Comcast issue would this be?