I have been experiencing a problem with one of my Directv boxes. Sorry I don't know the model but it is a fairly basic box (no HD) with a DVR. The problem is that occasionally the TV screen will go "wavy" (for lack of a better description) and then the screen will just go black. If I push the red reset button on the box and go through the reset process, the video comes back and is fine again for a couple of weeks. This only happens once every two to three weeks. I tried another box on the same TV and it worked so I assume it is a problem with the DVR box...right? If so, how do I demonstrate the problem for a repairman? Should I wait until it happens again and then not reset it until a repairman can get here to see the problem or is this a known problem that the repairman will recognize from my description? Its not that big a deal, but it does get old after while. Thanks for any feedback you can give. Jim