Does anyone have any experience with the CS1000 constantly making a clicking sound (like the amp is ccyling on and off)? The unit works fine when the switch is set to off (without the woofers, of course) but when I switch it back to "auto", the clicking starts. I've already unplugged it, unhooked the speaker level connections (it is bi-wired) and reconnected them. Same result. Please advise.