Windows Server
A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.
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I have a user that gets locked out of her AD account everytime she signs out, the computer goes to sleep, or she restarts her computer.
You can see in the event logs on the DC from where the user account is being locked out or where the wrong password attempts are comming from.
Then go from there. If it really is that client then there is probably some strange software on there.