strange accounting update

I am observing that some of the user’s sessions are accounting a wrong update which is very strange. The send/receive byte updated value for such sessions is always 4294967296 KB (4096GB). So if you aggregate both in/out it is 4096+4096 for a single session. It's really very strange why radius accouting is being updated with the same value for certain users on periodic interval. Any comments/thoughts will be appreciated. Thanks Andrew _________________________________________________________________ Hotmail: Trusted email with powerful SPAM protection. https://signup.live.com/signup.aspx?id=60969