I have had my AVIC-Z2 for about a year now, i received it when my AVIC-Z1 took a Shit. The sub woofer output stopped working, and would cause the subs to turn on and off because a short in the unit output. The Z2 worked great for about a year and now it started again on my new Z2. The subs turn on and off, same as when i had my Z1. I know its not the amp bc its new and this problem was persisting when i had my old amp as well. I bought the piece of shit with a 4 year warranty from Circuit city prior to them going out of business. Now im stuck bc now that they are gone i can't just bring it in