Audio trouble

My jvc radio keeps cutting out. In other words while driving if i turn the music up to loud it shuts the radio off. And then it comes back on. Im running a jvc 180 watt 4 channel unit to 2 4 1/2 sony explodes 300 watts each and im running 2 sony explod 6x9 400 watts apiece. So what size amp would I need or is it my radio is just fried

Need serious help audio comp coming up

I would ask the local audio shop but i'm competeing against them

PLese help

lil93