Tell me more about your setup. Is your Nanobeam receiving an IP address dynamically from the router or is it static? The first thing I do when I setup a Ubiquiti radio is change the default IP to something else. Also, as has been mentioned, I have my DHCP server set to only handout addresses that are in a specific range above .100. All my static IPs are in the 0-99 range. Lastly, for now, if a radio sees a power surge they will often reset to the factory IP address.