The amp has been going in and out since i got it. it worked for about a month and just the other day it starting working when on accessory (12v) but when i turn the car over it goes into protection. ive tried turning head unit off before starting its not voltage spike. the amp i had in place of it worked perfectly in the same wiring. i just unplugged all speaker wires and rcas and it powers on but when i pug in an rca it goes in and out of protect. someone please give me some trouble shooting solutions i can try. is the amp defective? also all speakers are at 4 ohm i tested with ddm. im grounded right to battery in the trunk.