Axiom Home Page Forums General Discussion Home Theater Amp Problem?

My system is as follows:
Front: M80
Center: 150
Surround: M40
Surround Banck:M40
Sub: SVS
B&K processor
Marantz M9000 for front, center and surround
2 Marantz M500 for surround back
Denon 2200 DVD Player

All speakers were set to Large
Last Sunday pop in the movie "Seabiscut", crank up the volume to -15db, I could almost feel the horses were running besides me. But all of sudden, the front and center lost the volume, initially I thought one of the speaker wire was shaken loose by the vibration. After thoroughly examined, all system set to go. I replayed the horse reacing scene again, same happened but when I lowered the volume and the sound came back. After reset all my speakers to small, I replayed the whole movie again without a hitch. Just want to confirm here with every pundit in this forum, the problem is my Amp, isn't it.