@Nowtside
Hi,
I did not find more information about event ID 1103, it seems to apply to server 2008.
While event ID 1104 applies to windows10, if the maximum size of Security Event Log file was reached and event log retention method is: “Do not overwrite events (Clear logs manually)”.
For your reference:
https://learn.microsoft.com/en-us/windows/security/threat-protection/auditing/event-1104
Hope above information can help you.
============================================
If the Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread