My amp shuts off when it's on for a while. If I turn the subs up wide open on the head unit..I can drive for about 15 minutes with the volume quite loud. The subs will kick out, then kick back in, then kick out. If I turn the volume down and the subs down on the head unit, the subs will not kick out but it sucks because u can't let the bass thump. Ive had this same amp and subs in different vehicles and it has never done this but i had a different head unit. Any ideas?