DJM 900 loud buzz & sound cuts while using effects HELP

im using djm 900nxs with two cdj 850s and USB sticks. sometimes when i turn djm on and begin to mix sometimes when i touch the reverb/beat effects button i get this super loud buzz way louder than whatever im playing on the decks for a second and the R channel on the goes into the red. it keeps repeating "buzz buzz buzz" then the DJM sound sometimes then cuts out completely and i have to reset it.

as far i can tell this only happens when i use the effects and seems to be only on the right side master output/booth out.  what could this be? i just upgraded firmware incase that was it...waiting on new cables and im hoping its just a bad cable