i have 4 XTi-2000 power amps that will just shutdown for no reason. at times they will shutdown with no signal going to them and sometimes they will shutdown during a performance. they will do this without warning. each amp is used to run a dual 18" sub in 4 ohms bridged sub mode. these amps have been replaced once by crown already for this problem and i am still having the same problems. i have talked to my audio supplier about this problem and they have informed me that i will have to contact Crown because they will no longer sell this product due to the amount of problems that they have had with them. i have also talked to the crown rep's and they act as if i am making this problem up. so what do i have to do to get this problem resolved?????