I have a kenwood kdc919 (something like that), lanzar component speakers up front, lanzar 15" sub, lanzar amp, and kenwood six by nines. The 6x9s keep on cutting out while I am driving, so I made sure the connections were all good, from the back of the head unit all the way to the speakers, there is not a problem that I can see. Is it my head unit?? It is brand new, but no warranty. Any thoughts on what it could be?? Thanks ya'll.