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Why frequent account locked out - Event ID 4740

Last Modified: 2016-06-20
We have frequent account locks out that seem to be origination at user's workstations:

A user account was locked out.

Subject: Security ID: S-1-5-18

Account Name: DomainController$

Account Domain: NT_DOMAIN

Logon ID: 0x3e7

Account That Was Locked Out: Security ID: S-1-5-21-2030126595-979527223-1756834886-1337

Account Name: JohnS

Additional Information: Caller Computer Name: JohnS-PC

It affects only certain workstations on the domain, and we cannot pinpoint what is actually causing this behavior. We started noticing it last week - on the day we have added New routable UPN Suffix to all domain users. We have no idea if this is the cause or just a coincidence - we've seen this happening before, but it was usually caused by phones or persistent network connections. Any ideas how to tracked down a problem?
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