4D server and integrated domain server authentication raises issues

We are running with a 4D server v17.3 HF3 64bits / server Win 2012 R2 64 / new network layer / interpreted / 200 users / Windows active directory.

We are getting some troubles when trying to activate the integrated domain server authentication.
The feature seems to work fine but our server is facing transient freezes and sometimes some users are disconnected.

If we disable this feature, the server comes back to a normal state.

I don’t understand why such a feature could have a side effect on the server behavior, but it has…

Does anyone experienced the same issue ?