We have all new wiring a brand new 1000 watt sony amp, fuse is intact, pioneer headunit. Music and sub will work and then music will go out and just the sub will work. Just bass plays. Then it may sound scratchy and maybe come back on and then the music will cut out again. This seems to happen when its hott outside or in the car. Played fine the whole way home tonite, but it was cool outside. Don't know what else to do please help!!