Hello! Finally managed to find the issue again, and enabled sync logging, this is what I could see:
slapd starting do_syncrep1: rid=000 starting refresh (sending cookie=rid=000,csn=20240724113017.421010Z#000000#000#000000) do_syncrep2: rid=000 LDAP_RES_INTERMEDIATE - REFRESH_DELETE
I am unsure of what it means.
As for the size of the database shouldn't be particularly big, maybe 50 users and 50 groups. I will try to increase the sessionlog as mentioned, but any further advice is very welcome!
BR, José Pereira