Just got my T400 a week or so ago and have been getting the following message in Event Viewer:
Description: Intell(R) Wifi Link 5100 AGN: The adapter has detected that the Token Ring cable is disconnected from the adapter. Please reconnect the Token Ring cable. The adapter will continue to try to reset until the connection is repaired.
* Updated Intel drivers and management software
* Installed XP SP3 and all updates