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Certainly, check the wired boxes for dupes, but an intermittent problem screams "wireless". I'd start by setting up WPA authentication/encryption for your wireless LAN. Intrusions aren't always intentional. People often connect to the wrong access point accidentally just by nature of proximity to their AP vs. your AP. If they're using static addresses in your DHCP range you end up with dupes. WPA prevents their access to your access point so negates the problem, as well as securing your WLAN against intentional attacks. WEP would also help, but it's very weak in comparison. MAC filters help but it only keeps very honest people honest.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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