Experiencing sound drop and video pixelation on recorded and live TV, during regular TV shows like The Tonight Show, the World Series, all major network broadcasts including premium channels. All signal strength numbers are in the high 90 range, all physical connections are tight. I did a cold reboot, unplugging from the outlet as well as from the back of my HR54. Clear calm weather in Arizona. Any suggestions would be appreciated. If I call should I call DirecTV or AT&T? If they want to replace it should I ask for a HR17 instead of another HR54?