WLC 2112 - APs disassociating

Question

I've found some discussion on this, but nothing that's helped resolve so I'm hoping someone can help. We recently purchased a 2112 WLC, running version 6.0.199.4. I have everything running through a single port on the controller, which is connected to a trunk port on our 3750 stack. Our management VLAN is vlan 40, and AP is plugged into another port on the same switch which is an access port in vlan 40. APs appear in the controller ok, receive an IP address, but we aren't able to connect to any of the WLANs and periodically the APs will disassociate with the following messages:
0
Thu Mar 22 09:47:51 2012
AP 'AP003a.99eb.702d', MAC: b8:62:1f:45:95:b0 disassociated previously due to AP Reset. Uptime: 0 days, 00 h 35 m 52 s . Last reset reason: operator changed 11g mode
1
Thu Mar 22 09:47:39 2012
AP Disassociated. Base Radio MAC:b8:62:1f:45:95:b0
2
Thu Mar 22 09:47:39 2012
AP's Interface:0(802.11b) Operation State Down: Base Radio MAC:b8:62:1f:45:95:b0 Cause=New Discovery
I'm not sure if that's related to why we can't connect to the WLANs or not...
Another wrinkle is that if we plug in the AP directly to one of the PoE ports on the controller, it all works perfectly. Any ideas? I'm guessing its something switch-related since the only difference is that we're not going through the switch when it works.
Thanks in advance,
Matt

Answer 1

Both APs in the same switch and in different switches do the same thing. They don't reboot, just disassociate. Here is the status on one of them:
UP time: 2 hours+
Controller Associated Time: 6 minutes
Controller Association Latency: 14 seconds
They associate as soon as they come up, but then disassociate and reassociate. They have this message:
AP's Interface:0(802.11b) Operation State Down: Base Radio MAC:b8:62:1f:45:95:b0 Cause=New Discovery
in addition to sometimes showing a Heartbeat Timeout cause for the disassociation. In addition, sometimes it shows the cause being Max Retransmissions. I thought it was just the AP, but it happens with the second AP as well. Here are my switch port configs:
For AP:
interface GigabitEthernet7/0/14
description Test AP
switchport access vlan 40
switchport mode access
spanning-tree portfast
For WLC:
interface GigabitEthernet7/0/2
description WLC Management Port
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 40,55,82,94
switchport mode trunk
spanning-tree portfast trunk
It is detecting Rogue APs (these are the existing APs that we want to replace with this system). Could that be causing issues? I don't think so since it works just fine when plugged directly in to the WLC.
Could it be WLC software version?