Hi Yamaha Team!

I am getting intermittent buzzing feedback noise from my monitors when I am using the Montage to my PA system with a Behringer Mixer. Connection setup: XLR from House to DI box 1/4 inch cable from DI to Montage using a female adapter to Y 1/4 in to the L R Mono Output. I only hear the intermittent buzzing noise when the Montage is turned on to play and I have to lower the master volume to lower the noise.