My COMCAST Fox-33 KMSS Shreveport SD signal (shown on COMCAST chnl 8) keeps acting up. Approximately every 40-60 seconds the picture will freeze or go black for about 1 second, then it will flash green and the video will continue. The audio is never affected, but during primetime this is really starting to be a bother. It only happens on this channel, no others, so I don't see it being any of my equipment or internal house cable. It's happening on all 4 connections. Of course when I contact COMCAST, no one else has complained about a similar problem. Is anyone else in the Shreveport LA area experiencing this?