NEWS ZONE

About every other Saturday for months the pictures on NEWS ZONE goes out (but not the red station information or the movable highlight frame) and does not return until the following Tuesday.  All other "ZONE" channels work fine. I tried calling the problem in and went through the usual "We have no other complaints.", reset the box, check connections, then offer to send someone out.  It is not logical that it is my equipment because, the channel works except for the pictures, all other "ZONES" and other channels work, the outage is regular and the return is usually regular.  What is going on?