Why are there no audit events in the Security log?

Question

Windows Server

Good afternoon.
There are 3 domain controllers on Windows Server 2012R2.
Yesterday, suddenly, they stopped being written to the Security log of the user login audit event.
After a little investigation, it turned out that these events had not been recorded at one of the DCs for a week and a half. I can’t say for sure whether this is a failure or whether users simply did not log in through this DC.
The corresponding policy settings are in the Default Domain Controllers Policy.
On the Internet, I did not find information on such a problem.
Please help if anyone has any ideas.

Answer 1

Solved a problem.
Used policy setting 1 instead of 2.
Although before everything worked with setting 2.
Axian, I did not see it. Looked. Deleting audit.csv did not solve the problem.

Answer 2

https://www.petri.com/forums/forum/server-operatin...
https://blogs.msdn.microsoft.com/spatdsg/2011/06/0...
https://social.technet. microsoft.com/Forums/window...
Have you seen it?