Well without being able to see your setup in person, i would start by replacing your deck as well as your box with a custom box. Port area is prob to small for the subs, or if sealed to little of airspace with incorrect filter settings. Those subs dont blow unless your doing something wrong. Reason i say change your deck out is Ive seen often the rca outs with sometimes fail and start actually sending dc voltage to your amp as most know audio signal through rca outputs is ac. This will in turn make your output on the amp side send some dirty *** power to your subs causing them to smoke. As well as changing deck and box make sure your grounds are great on both the amp and deck and that your not having massive amounts of dc mv going through the chassis of your vehichle. AKA engine noise. Cus if you do that can in-turn can play hell with signal voltage and grounds for the amp. Dirty power again. After having done this and problems still occur saying your voltage is holding and your not being Treckless, then your answer is simple something is jacked up in the amp get it warrantied or buy a new one if no warranty. Thats the best i can say from as far away as i am