SBS 2008 Unexpected Shutdown

I have had 2 SBS Sever 2008 Machines running in the same environment for
nearly a year now with no issues, one machine is the Domain Controller with
the FSMO roles and the other is used simply as a File Server.

Over the past two nights the File Server Machine has shut down, in the
machines event log the following Events are listed.

Event ID 1074

The process C:\Windows\system32\silsvc.exe (FILE-SERVER01) has initiated the
power off of computer FILE-SERVER01 on behalf of user NT AUTHORITY\SYSTEM for
the following reason: No title for this reason could be found
Reason Code: 0x2000c
Shutdown Type: power off
Comment: Licensing Compliance Service caused a shutdown. Please look at the
events under Microsoft > Windows > Server Infrastructure Licensing >
Operational for details.

Event ID 38

The Additional Server Count Check detected a condition in your environment
that is out of compliance with the licensing policy. This server will be
automatically shut down if the issue is not corrected in 179 day(s) 11
hour(s) 0 minute(s). Please look for additional events for Additional Server
Count Check to troubleshoot

The Additional Server Count Check in the Licensing component did not pass
because error 0x8007203a occurred in function f4 [KOAU].
The server is not operational.

Event 4

Make sure that your DNS server can be contacted and the following services
are running: Active Directory Domain Services (NTDS), DNS Server (DNS),
Kerberos Key Distribution Center (KDC). This server will be automatically
shut down if the issue is not corrected.

Has anyone had the same issues..?

Regards