To begin I think it's nice to know about what Pioneer hardware you are writing. Maybe you can update this in the topic question.
Did you try another set of XLR cables, to see if this works? Otherwise the XLR outlets in your Pioneer hardware may have come loose from their soldered contacts on the pcb. Often this happends when the XLR connectors from the cables are in the outlets and under pressure for a longer time. Maybe they have been stuck in a small flightcase, or something else is forcing the connectors.