When you say "main network," does that mean your DJ kit is connected to a router/hub/switch that shares other sources–internet connect, multi-CPU network, etc.? If so, that could very well be the problem. Personally, I use an unmanaged desktop switch. Specifically, this relatively inexpensive beauty. At all times, the switch is only connected to my XDJs, DJM and CPU (MacBook Pro Retina, Yosemite).
