I don't think this is related to either VC or the Broadcaster plugin.
Broadcaster would normally only generate events that start with "Broadcast." not "System." unless you have manually changed the broadcaster plugin settings.
And of course, VC only sends UDP messages to EventGhost when you execute an EG action.
This method of UDP communication between VC and EG has been extensively used for several years without any significant problems other than those caused by user error, so I suggest you look elsewhere for the cause.