IAS and re-authentication

Hello


I am having problems with Wireless clients re-authenticating against ISA
Radius on W2K3s all the time

I receive messages like this in the system log, and everytime
re-authenication happens, the connection i broken for a few seconds:

User xxx\xxx was granted access.
Fully-Qualified-User-Name = xxx\xxx
NAS-IP-Address = xxx
NAS-Identifier = 1100-AP2
Client-Friendly-Name = 1100-AP2
Client-IP-Address = xxx
Calling-Station-Identifier = 0012.f0b7.2ae4
NAS-Port-Type = Wireless - IEEE 802.11
NAS-Port = 1530
Proxy-Policy-Name = Use Windows authentication for all users
Authentication-Provider = Windows
Authentication-Server = <undetermined>
Policy-Name = Allow Wireless LAN Access
Authentication-Type = PEAP
EAP-Type = Secured password (EAP-MSCHAP v2)

How can I correct this issue?