10.3 Standalone Server User being disabled

I have a 10.3 Server used for filesharing (both via AFP and SMB). On of the users keeps getting disabled and I’m unable to find the cause of the issue. While looking at the Password Server logs this morning I saw this:

Jan 18 2007 08:41:58    RSAPUBLIC: ok
Jan 18 2007 08:41:58    GETPOLICY: user
{0xyyyyyyyyyyyyyyyyyyyyyyyyyyyy, the_user}, policies:
isDisabled=1 isAdminUser=0 newPasswordRequired=0 usingHistory=0
canModifyPasswordforSelf=1 usingExpirationDate=0
usingHardExpirationDate=0 requiresAlpha=0 requiresNumeric=0
expirationDateGMT=4294967295 hardExpireDateGMT=4294967295
maxMinutesUntilChangePassword=0 maxMinutesUntilDisabled=0
maxMinutesOfNonUse=0 maxFailedLoginAttempts=0 minChars=0 maxChars=0
passwordCannotBeName=0 isSessionKeyAgent=0
Jan 18 2007 08:41:58    QUIT: {no user} has disconnected.

At this time, there was noone in the office. I can’t find any thing in system.log or secure.log that corresponds with the time stamp. Any ideas what might be causing this?