Cisco Aironet 1200 series AP's...

Hi,
The wireless at one of our remote sites was working fine until there was a problem one week back. Just for introduction we are using the following setups for wireless:
independent wireless access-points whihc connect directly to the Cisco switches most 2950's..
We have three vlans in LAN, vlan1 (for user - LAN), vlan-4 (for wireless users - EAP auth with MS-IAS s radius) and vlan-5 (for wireless scanners - MAC auth).
All the AP's are 1231G series of devices.
These AP's are connected to the switchports with a trunk, dot1Q enabled, vlan-4 as native vlan.
Suddenly one day, 12 out of 15 AP's went offline, meaning: we were not able to ping any of them except 3 which were working fine. When checked at the switch we were able to see all 15 of them as CDP neighbor of the switches, even the ones which were not able to be pinged on the network. We were not able to ping them neither from the local L2 switch (IP on vlan-1) nor from the site router (default gateway of all the local subnets).
I took the console connection of one of the not-working AP, it does not show any particular log or message. The Fastethernet0 port was UP/UP. I was not able to ping AP's default gateway. When I rebooted the AP, it was pinging from the network for about 2 mins and after that it was again off-network, not pinging. When the AP was reset to factory default, it was pinging fine for a long time, without any problems. When we put in the OLD configuration, again it was off-network, not pinging.
Now, here is the surprising element for me! After 3 days of struggled troubleshoooting, remotely, onsite engineer changed the vlan allowed on the WAP connected trunk switchports (ie switchport trunk allowed vlan 4,5) i.e previously we were allowing 1, 4 and 5 vlans on the trunk, now he is allowing only 4 and 5. As soon as he made the changes, all of the not-working 12 WAP's became online one by one (as and when config change made on the trunk). Just to make another test and to make sure, I tried to allow all the vlans again and guess what the WAP was again off-networ - not pinging.
Now my question is: Why it was all working fine for more than a year and then suddenly one day 'something' happened which caused the 12 AP's to behave abnormal while 3 of them were still working good.
Is there any technical theory which can explain such type of behaviour?
Thanks in advance,
Gaurav

Gaurav,
     If you have the ability to, I would put on AP back to the "non-working" scenario.  then check the ARP table to see if you are getting a duplicate mac or IP address.
HTH,
Steve
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