I recently bought a evo ssl 4000 watt mono block amp hooked it up worked fine for a few days went to turn it up a day or two later and it stopped working went into protection mode and made a thump thump thump sound constantly Un hooked it and hooked another amp up witch is a Kenwood 1000 watt amp and works fine but had someone look at it and put power to the amp and it worked turned power light on and protection light off and ideas