i have a 75 coupe deville with 2 15" subs connected to a pyramid amp. everything worked fine until a few days ago i was driving home and my subs cut off. i turned off my deck and turned it back on and the subs were popping. the system was working for a few months with no problems and it happened out of nowhere. i checked all the connections and everything is good. does anyone have any ideas on what i can do to fix this?