Aironet 1240AG error - "Previous authentication no longer valid" Help!

I am an IT professional that is installing my first extended range wireless AP in my companies warehouse. I am very excited!
Now I have set up many a linksys and repeater wireless networks, so when I was looking into the Aironet 1240AG I thought ?No Problem!?
And at first, it is not!
I have the AP and antenna set up here in my office before I take it out and mount it in the warehouse. And I can get connected to it, no security for now, no filters, I just want to connect and make it work.
I stay connected for maybe 3 minutes, I can get to the internet, I can ping all my servers. Full connectivity. But then for no reason the connection fails and I cannot reconnect.
The error I get in the log is
Interface Dot11Radio0, Deauthenticating Station 0006.2510.bbe3 Reason: Previous authentication no longer valid
So strange! So I have reset the AP to factory defaults and then set the SSID, and I can connect, again for a second, then nothing.
I have tried with multiple wireless cards, even laptops. Thinking maybe the problem was on the computer side.
But now I believe I must have some setting wrong.
Could someone please shed some light on this situation for me! I searched the forums but could not find this error message in this context.
Nate York

Interesting...I am experiencing the same problem, but when adding another laptop to the existing 5 Aironet 1100's. The existing laptops work fine, but when trying to add another node, I see the problem. I get the following error message in the error log as well as the activity screen;
Interface Dot11Radio0, Deauthenticating Station 0002.2d34.a0fe Reason:
Previous authentication no longer valid
Unit - 6 units
Cisco Aironet 1100 version 12.3.(07)JA
The error takes place with no other units online, or when other units are in use. Also the laptop in question "shows" connected to the AP (yes I have tried other APs all with negative results). The settings on the laptops are all the same, so i am at a loss.
Any suggestions greatly appreciated,

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