I recently took a gamble and picked up a refurb HK AVR8000 from Ubid. I haven't had any issues with it to date (~2 months), but had something turn up last night, and I'm wondering if anyone else has ever seen it. Unfortunately, it was my wife who experienced it, so I don't have first hand information. She was listening to a cd (logic 7), and then heard a clicking noise, and all speakers except the subwoofer shut off. The cd continued to play, with the only sounds coming from the sub. When she switched sources, the problem remained. I had her unplug the unit, then plug it back in, which seemed to resolve the problem. She did mention that a few times after that, she heard the clicking noise again and the sound on all the speakers except the sub reduced volume briefly, then returned to normal. This worries me a bit, as it's obviously not supposed to do this. I'm going to attempt to recreate the problem this afternoon. Could this be heat-related? The receiver is in an open-air rack, with breathing room on 3 sides, but top-to-bottom, it's a very tight fit. Anyone ever experienced anything like this with their HK receivers? Any idea what the problem could be?