The HR22-100 in our living room has started making a clicking sound. It doesn't seem to be the hard drive though. About every 10 seconds it will make a higher pitched click, then about a 2 second pause, and then a lower pitched click. It sounds like a relay switching or like the sound some TVs make when they switch resolutions. The receiver works fine otherwise. I cannot really hear it when a show is playing, but it is driving my wife crazy. Rebooting the receiver fixes it for a few days, but it eventually comes back. Any ideas what this could be? It has lots of saved shows, so I hesitate to swap it out .. plus the luck of the draw as to what I will get as a replacement.