could it be the amp overheating, I know I have a punch 400 with 2 12's and if I have them up and back seats are in place like supposed to be, they will do that, so when I want to have them hitting hard, I fold down the back seats, which gives more bass up front along with airflow to the trunk cooling my amp.
~~~~~~~~TRAVIS~~~~~~~~ Now driving: I MEAN NOT DRIVING---- 1995 Contour SE Maroon, MTX, sunroof w/rain-guard, neons, and audio replaced. Side Markers installed and headlight strobes also now on. *KKM tru-rev - I love it 9mm FMS blue wires SVT Upper SVT exhaust SUPERCHIP˛ custom ram air Newest mod = f***ed up engine, prolly shot, yeah 
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