active directory account locked out frequently

Hello ,

I'm windows admin ,a user report to me that after he changed his password after expiration his account is locked out frequently ,I asked him to disconnect all network drives , I make sure no applicatin is using old password ..... but the issue still persist I would like to know if there is any tools like Account Lockout and Management Tools for windows 2008 R2  to help me determin why this account is loked and which computer or service is  tring to log on with his account

Regards