I have an 03 cobra with 460 mach system, i had a 6x8 blown so I put 4way pioneer 6x8 in both front doors. (they were on clearance) after the second side the speakers want to cut out on their own once in a while but other speakers play fine. What is this? this isn't the first time i put speakers in and have done wiring with amps and such. But i'm not sure if their are safety devices on these stock car amps or the deck. The deck was replaced once when I first got it because the cd wasn't working. should I go after market?