i'm running two jl w3 12's with a 600 watt rockford fosgate amp and i can normally turn it up to full power on the amp (the subs aren't gettin the power they should be so i know they won't blow) but every once in a while they will just shut off..my amp is still on and lit up and after it shuts off when its been turned up really loud i'll turn it up half way and they'll shut off again...the only way they come back on is if i turn my car off and turn it back on...any help would be much appreciated