Networking query - 'Another device using network'

Hi,
I keep getting a randomly timed message that another device is using my network even when there are none of my other network devices turned on. Setup is WPA2 Personal network and it is passworded.
Whatever it is seems to pick up IP addresses that I've previously listed as servers in Finder/Go/Connect. These were set up to facilitate file transfers to iPhone but I've made sure that the iPhones were turned off and I still get the message. I've tried clearing these server addresses out of Finder but they reappear on the list when I refresh the menu option: Finder/Go/Connect To Server.
Does this mean that someone is hacking my network and potentially using my internet?
Thanks,
Matthew

No other devices of mine use my wireless connection. I have long suspected someone of stealing my wireless service in order to cop my router's IP address. Could this message be indicative of someone outside my building using my wireless service?
Possibly. Do you secure your wireless network with WPA2 and use a strong password? Do you change this password periodically? If you can say "yes" to both, the chances of someone connecting to your network is extremely unlikely.
The other reason, you may be getting this warning is that the DHCP services, either on the server (router) or the wireless clients themselves are not configured properly. DHCP is used on the local network to assign Private IP addresses to network clients. These addresses, by default, are dynamic and will change on a set time period. If a network client is not configured properly it can "refuse" to accept a new address and can potentially have the same address that the DHCP server hands out to another device ... and thus, the warning message.

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