I did my first live gig with my Studio Live Series III 32SX and a pair of NSB 16.8s. I had certain channels repeatedly dropping out briefly over and over again. Channel 18 with an SM57 on an electric guitar amp and channel 19 with an SM57 on an acoustic guitar were particularly bad. At first I thought it might be a noise gate issue but even with the noise gates off it still happened. I checked the mics and cables and they are fine. I also haven't been able to duplicate the problem at home. I do know the line voltage at the gig was sagging, could that have caused this?