User account being frequently locked out

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http://serverfault.com – We are running in a Windows 2008 / Windows 7 environment. One on my users is being locked out of his Active Directory account on a daily basis. This occurs between 10 and 18 hours after each reset. This just started last week. I can see that the reason for the lockout is a failed number of password attempts. However, the user is not failing any attempts when he unlocks his system. Therefore I am thinking that there must be a service, or some application, that has held on to his credentials (possible old?) and is trying to access the network in someway thus triggering the lockout event. A (HowTos)