User's AD accounts keep being locked automatically. I'm confident it isn't the obvious problem with users typing in the wrong password repeatedly.
Whenever this happens the System log in Event Viewer is full of messages like:
Event ID 8005 The browser has received a server announcement indicating that the computer X is a master browser, but this computer is not a master browser.
Event ID 8009 The browser was unable to promote itself to master browser. The computer that currently believes it is the master browser is X.
Event ID 8019 The browser was unable to promote itself to master browser. The browser will continue to attempt to promote itself to the master browser, but will no longer log any events in the event log in Event Viewer.
I'm assuming the two are related, but am having trouble finding anything to back this up.