I have X440-G2 switches and the clients are 802.1x authenticated with NAC. In recent days i found that clients disconnect automatically in less time with different reasons as listed below.
"The session is no longer active due to: Admin-Reset"
"The session is no longer active due to: Session-Timeout"
I have checked the timeout settings on NAC manager as well as switches. It is default and looks normal. No changes done.
Couldn't able to predict the cause for this issue.