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Princeton figured out a bug in a number of the Android kernels (2.1-3.0) where a device continues using an IP from an expired DHCP lease. http://www.net.princeton.edu/android/android-stops-renewing-lease-keeps-using-IP-address-11236.html We've been seeing intermittent issues with devices losing and resuming connectivity on the wireless network (but not dropping connection to the AP), and it seems like this could explain it with phones jumping on the network intermittently and taking IPs that other devices are using. At a minimum, I hope ATS is aware of this gem as it seems like it could easily apply to our wifi infrastructure the same way it did to Princeton.