Change Auditor

What would prevent Change Auditor from reporting lockout events?

What would prevent Change Auditor from reporting lockout events?  It reports User Account Unlocked, but not User Account Locked.  They used to get reported and then they just sopped one day.  It stopped reporting lockouts 8/22/2017, but I don't recall any updates or changes I made at that time.  I'm running 6.9.1.  I have four coordinators reporting to the same database.  Everything else gets reported except User Account Locked.  Btw, I do see the lockout if I look in Splunk.