My A-S801 ( 2-year warranty) is making a seemingly random click sound and it is very annoying. I can force the amp to click, in the same way, by pressing a button on an unrelated remote control. After the click, the amp clicks a second time, a bit later. Bad remote control sensor? Yamaha support said to take the amp to an authorized repair center. So, I contacted the repair center and the estimated cost of the out of warranty repair is $250-350! So, on top of the $999 cost, you might have the repair cost in a couple of years. Keep that in mind while shopping for an amp. Hope this info helps. If anyone knows exactly what part needs to be replaced, please post the details/part number/procedure. Thanks.