It happens with many of my HD channels, the internal tuner goes to the channel, plays it for about 15 seconds, then drops the video saying the signal is too weak, and then drops the sound about 30 seconds after that. Then a couple minutes later it will come back up and do the same thing. The Slingbox is connected directly via a coaxial cable to the wall cable (which is Time Warner), there are no antennas involved. Any ideas? Do I need a booster or something?