I sent my first 990 back because there was no voltage at either of the 12-volt trigger outputs (i.e., it wouldn't turn on a trigger-controlled power amplifier) as confirmed by a voltmeter. Outlaw sent me a return authorization, I returned it, and the replacement works fine. I've had no problems with channel signal cutouts. I certainly suggest first emailing them; they may have good advice for you. If that doesn't work they (probably Steve) will email you a time to phone him. He was very helpful when I was having upgrade installation woes. Good luck.