When these addresses start showing up ("Duplicate IP" errors happening on multiple machines-more than a couple BAD-ADDRESSes showing up in DHCP and especially repeatedly even after reboots) I would go wire by wire in your closets (check all your uplinks) and make sure things flow logically from switch-to-switch and to your routers, and that there is no looping. Also check you don't have 2 servers authorized doling out overlapping or similar DHCP scopes. You have a different DHCP scope for each subnet.the client gets a DHCP address from the server then tries to get a 2nd DHCP address for the same nic from either that same DHCP server or different one, depending how you're set up. This can occur when a switch associated with one subnet is linked to another switch associated with a different subnet. Check your physical network architecture.
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