Make sure the ground wire is not loose. You may also want to check to make sure the amp is not going into "protect" mode. Does the woofer turn off at any specific time, or is it random? To me, it sound like a bad ground wire, or maybe the remote turn on wire, especially if you just put in a new deck.
Scott


Scott Mabe I WILL be Phil. 1999 Contour SVT, Tropic Green BAT kit, K&N RU-3530+MAF, Magnecore 8.5mm, some audio goodies, Hightowers, Knauberized, tatoo by Parkedcar.