whats happening

ok i've had my clarion vrx925vd for about 5 months and all of a sudden its not working when my installer put in a relay...its in a 2002 ford explorer...so anyways were getting ready to send it back to clarion for a replacement so my shop installs a pioneer p4500 or something like that...and today i'm driving and my sub amps aren't working and the radio isn't working either, with the clarion it would pop out but just no display whatsoever and with the pioneer it turns on but no sound and then sound sometimes does come on but it turns right off...and my two mono amps are also not working for some reason...all happened at the same time...any hints...i had two really good shops here check out the clarion and they said that all the wirign was good and that the voltages are up....but now its also happened to the pioneer so i'm really confused..should i have the clarion installed in another car to see if its not broken..cause i don't think it is....please help real desperate..could it be the factory wiring...they said that all voltages were good...just lost And it can't be a loose ground wire can it if their is still power going to the unit...like the display on the pioneer is still comin up and on the clarion the deck motors in and out and when its in it has a blue display no numbers just a display...help...