broken kicker zr600
ive got a kicker zr600 powering 2 kicker L7 12's. It has worked fine for a month, but now its skrewed up. it works fine on low volume, but when i turn it up it turns off and it'll cut on for 1/2 a sec and turn back off for a while. i found that when i pushed on the amp, it worked, but when i took my hand off, it quit again. and on top of that, the guy who installed it put a 10ga ground wire that is like 3ft long on there with a 4ga power wire. dont know if thats important or not, can someone help me find the problem and/or solution?