This guide would get you going. Need to invest in a UZB3 which will be converted. The software is free. Z-Wave Sniffing, Zniffing And You: A Guide To Pulling Packets From Thin Air
Do you have reporting disabled on your ZEN25's (parameter 18)? Also what type loads do you have connected? Lamps, small appliances, etc...? I seem to have the most issues with one connected to a phone charging block. It is only 60watts max but it reports all sorts of crazy stuff randomly. Going to try and swap it out for another one to see if its the device or the load.
