We switched over to DirecTV a few weeks ago. One reason was so I could get Speed HD. In watching it the last couple of weeks, there is a common signal break up during circle track action events. The video signal will break up for like a second or so. The audio keeps going and stays in sync. It doesn't do it all the time, but it's quite frequent. We have the HR-21 DVR. Seems like when rewinding the DVR, the picture has no break up. Anyone run into this or know what the problem could be?