Active Directory sync / gpupdate

Hello everyone,

It seems that the domain controller with the AD DS role that I manage is failing.

There is no longer any synchronization between the clients and the server, and when I try a gpupdate /force, here is the result:

Updating policy...

The user policy update completed without error.
The computer policy could not be updated correctly. The following errors were encountered:

The group policy processing failed. Windows could not resolve the computer name. This incident may have one or more of the following causes:
a) Name resolution failure on the domain controller.
b) Active Directory replication latency (an account created on another domain controller has not been replicated to the current controller).

To diagnose the failure, open the event log or run GPRESULT /H GPReport.html from the command line to access the group policy results.

Not much additional info in the GPReport... :(

I suspect a DNS issue but I have no further leads and I can't find any help on this topic online.

Thank you in advance.