sorry to reply so late

......I don't think I have an answer for you but I want to understand you situation better.
Which device does the DHCP for you?
Assuming that you have a Wireless Router and your APs are connected to the router (if that's the case)......Can any wireless device close to the router get an IP address from the router (not from AP) ?
Again, assuming that you have wireless router, have you disconnected the APs and see if you can get an IP address from the Router wirelessly?
Cheers