I've noticed in the last two weeks or so that my TU-HDS20 has developed a "clicking" sound (like the contacts of an internal relay or switch) that seems to come in threes or fours and occur randomly. Once, I even caught the unit turning itself "on" (the fan started) clicking several times and then placing itself back in standby mode (fan and LEDs back off.) Despite this activity, I haven't noticed any adverse effects from it, but I'm still concerned. I've used it relatively trouble-free for OTA and standard DirecTV (no DirecTV HD) except for the common gripes but this has me worried that the hardware may be flaking. Multiple resets and power cycles (some overnight) have not alleviated this problem. Could this be DirecTV messing with my unit somehow? Or does it sound like I may have a problem? Any comments or help appreciated.