Last night while watching a recording from my HR20 over MRV, the picture pixelated a few times in the beginning. Toward the end of the show, though, during the last 10 minutes, the recording would stop & display the message that the receiver had dropped from MRV. Sometimes I could just hit play again, sometimes I had to get out of the program & go back to it. It's not an issue with the network -- all of the boxes have static IP addresses & none of the other boxes had network problems. The HR20 also was off a few days ago & I had to unplug it & plug it back in to get it to come on. What tests do I need to run to see if there are any issues with it?