BOOGER

I have had a JVC El Kamelion in my '97 Z28, the rear seakers have worked for a while. Then they started to cut in ond out so i redid the wiring behind te stereo. That fixed the problem for about 4 months, and for the last 2 weeks I havnt had any speakers in the hatch and the speakers in the middle are not workng well but the passenger side middle works occasionaly. I cant figure out the problem and i have already checked the wiring behind the stereo and the speakers and it is good. I was wondering if it was the amp or bad wiring or something i overlooked.