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Vista client keeps dropping off Aironet 1100

We have an installation consisting of three Aironet 1100's. The system works fine and is rock solid for everyone except for the one client running Windows Vista. Their computer keeps dropping off and back on the network. I mention that it has Windows Vista only because it is the only unique thing about the computer I can think of.

Looking at the 1100's logs, we see this when this happens:

Interface Dot11Radio0, Deauthenticating Station 0018.4dbe.6f66 Reason: Sending station has left the BSS

Then, one or two seconds later, we have:

Interface Dot11Radio0, Station 0018.4dbe.6f66 Reassociated KEY_MGMT[NONE]

This keeps happening every two or three minutes.

The 1100 reports that this client has -74 dBm signal with 23 dBm S/N.

We've tried three different wireless cards on this computer, and tried both the XP and Vista drivers with all of them but none of this has helped.

The 1100 is on 12.3(8)JEA, which is the same on all the 1100's in the network.

Any ideas?

Thanks.

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