I have the ZR-120 hooked up, and when i hit a bump the other day in the road, one of the subs stopped working, i figure loose wire, so i checked the wires, everything's tight and it just starts working again.....then both stop working...so i check the 'subwoofer crossover module' that plugs into the side...it was loose...push it back in....the speakers kinda push out like they're hittin but only for a quick second then they don't work anymore. Any ideas???