I put my 2 15s on Craig's list for sale/trade and today someone inquired. traded me a ct sounds 500.1 monoblock. all was well for about 4 hours, until the amp just cut off. it performed fine, then when,I was driving back from the store it just cut out... all of my wiring is fine. they're all hooked in right. I have a bad feeling I got scammed but I don't think a damaged amp would've held up for that long. any suggestions,on what I,should do?