Cannot access root shares (sysvol, netlogon ,etc) by using domain.local, but can if I use fqdn of server or IP.

Hi,

Here is the current situation:

1- I can see list of shares if I access domain.local.
2- I cannot enter any share if I use domain.local (clicking from the list of shares). GPupdate is failing too...
3- If I use fqdn of server i can access each folder without issues.
4- If I use IP i can access each folder without issues.
5- nslookup of domain.local is ok
6- computers can join without issue to domain.
7-No errors in dfs (event viewer). But this does not disqualify dfs as the problem.
8- This was working a few days ago perfectly. In a previous setup the server was only AD / DC , no dns or dhcp involved. Recently we moved all the dns, dhcp , wins, etc to the core AD/DC server (same server im talking above), because we were having issues integrating with some other systems (user integrations).
9- Issues with integration / sync of AD cleared, but now this new problem arise. This cause suspect for dns issues , though i can resolve and ping anything.

Its been a few crazy hours, literally no sleep, maybe some of the real experts have an idea :D?

Windows Server 2012 R2. Workstations are Windows 7.