The information (between "data" and "vece") embedded in log message are WELL DEFINED REASON STRINGS.
For example G., 775 is “user account locked”. Some of the other reason strings are:
52e invalid credentials
525 user not found
530 not permitted to logon at this time
531 not permitted to logon at this workstation
532 password expired
533 account disabled
701 account expired
773 user must reset password
Sometimes these messages are intermittent due to "account lockout duration" policies. The account lockout duration can be found at:
Windows server 2003: Domain Security Policy > Security Settings > Account Policies > Account Lockout Policies > Account Lockout Duration.
Windows Server 2008: Administrative Tools > Group Policy Management > Forest: > Domain (select the domain) > Domain Controller > Default Domain Controller(right click and edit) > Computer Configuration > Policies > Windows Settings > Security settings > Account settings > Account Lockout Policies > Account Lockout Duration.
By default, the time is 30 minutes. Hence after 30 minutes the lock will be removed; thus being perceived as intermittent. You can also contact your AD administrator and manually unlock on a per-request basis.