VLAN Access Point Block 4 Minutes

[KhLau]

Sorry for my bad english. I'm currenlty using ver 2.0 RC3 with 3 NIC and 5 access point (AP1 - AP5). All access points with two SSID and two VLAN connected to DMZ
segment VLAN 10 and 100. I can connect access point AP1 sucessfully while select the other AP's it can get the DHCP but it will blocked access 4 minutes? Any sueestions?

Thanks