I am still new to the home theater systems so I hope someone could answer my question. I have a Pioneer VSX 524K receiver, Polk CS1 Series II Center Speaker, Polk Monitor 50 Series II Floorstanding Speakers (use as rear/surround speakers), Polk PSW10 Powered Subwoofer, and Kilpsch Synergy F-20 Floorstanding Speakers (use as front speakers). I have been using them for 5 months and it was fine until recently the receiver is overheat and turned off by itself several time. Does anyone know what could possibly go wrong here? Could it be because the receiver and speakers are not compatible?