We are attempting to upgrade wireless infrastructure by moving to Wireless-N and WPA2 security. We are utilizing a Windows ISA server and Radius. The wireless setting are being deployed to end users via Group Policy. For the most part, this is going pretty well. Occasionally, the wireless status will transition to "Validating Identity". When this status displays, sometimes the user remains connected and is able to access the network. Other times they have been removed from the network. In either case, a "Repair" of the connection normally restores connectivity and eliminates the "Validating Identity" status.
Any suggestions as to what I can check to eliminate this problem?