Frsevent Test failed

Hi,

In two of my Prod Domain Controller, I can see frsevent failure error. The issue is started after the patch reboot.When I ran DCdiag I got below error.

There are warning or error events within the last 24 hours after the

         SYSVOL has been shared.  Failing SYSVOL replication problems may cause

         Group Policy problems. 
         ......................... BR-DC01 failed test FrsEvent

         There are warning or error events within the last 24 hours after the

         SYSVOL has been shared.  Failing SYSVOL replication problems may cause

         Group Policy problems. 

         ......................... BR-DC02 failed test FrsEvent

IN BR-DC02 server I can see event 13508,13509

IN BR-DC01 server I can see event 13565,13520

I can see sysvol and netlogon shares in both domain controller.

One thing i noticed is , I have created a test folder under sysvol and the test folder is replicating without any issue. But still when I run dcdiag I can see the above errors.

Can anyone let me know what all steps need to be performed to fix this issue.