looking at this you tube video it appears you have a video problem. I see that you are with an HDMI input on your tv video in . the video is cutting off and on which to me is the HDMI cable or the DTV receiver. I would hook up a dvd player using the same HDMI cable and the same TV input . see if the problem is gone. if the problem is gone then the DTV receiver is defective.
next I would go to DTV receiver settings and view all the sat signal amounts which should be above 90%. this would be in the dish pointing under settings. any signal that is dropping out and below 90% could be many things but the DTV repair person will at least know that leaving your home with low signal is not acceptable ..
I would contact DTV by email to resolve this issue and save all email contact info.. if you call and bitch you will not get this repaired any time soon.