Server 2012 R2 Essentials restarts every 28 Days - Server Infrastructure Licensing

A client has a Server Essentials server that is restarting cleanly every 28 days.
Its is the sole domain controller for a small office of 5 users.
We have checked all listed services are running, the server holds all FSMO roles, DCDIAG reports no errors.
Occasionally the server will report all Checks pass, we had 6 days days of this before it started again yesterday.

Extracts from the Server Infrastructure Licensing Logs include -

The Forest Trust Check in the Licensing component did not pass because error 0x80070008 occurred in function fe1 [DJCT].
Not enough storage is available to process this command.
Make sure that each primary domain controller in your Active Directory forest can be contacted and the following services are running on it: Active Directory Domain Services (NTDS), DNS Server (DNS) and Kerberos Key Distribution Center (KDC). This server will be automatically shut down if the issue is not corrected.

The Forest Trust 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 27 day(s) 20 hour(s) 0 minute(s). Please look for additional events for Forest Trust Check to troubleshoot.

The FSMO Role Check in the Licensing component did not pass because error 0x80070008 occurred in function f2 [NVCB].
Not enough storage is available to process this command.

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.

The FSMO Role 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 27 day(s) 20 hour(s) 0 minute(s). Please look for additional events for FSMO Role Check to troubleshoot.

Root domain check did not pass because error 0x80070008 occurred in function f1980 [RUQR].
Not enough storage is available to process this command.

Make sure that the domain that this computer is joined is reachable. This server will automatically shut down if the issue cannot be corrected.
The Root Domain 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 27 day(s) 20 hour(s) 0 minute(s). Please look for additional events for Root Domain Check to troubleshoot.

Any help would be extremely welcome.

Tom
west-comAsked:
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Cliff GaliherCommented:
Log tells you what the problem is. It can't check because there isn't enough disk space. You have a very full system drive.

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west-comAuthor Commented:
Thanks for your response. System (C:) has 60% free, System Reserved has 16% free.
System reserved seems low but its in-line with others we manage.
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Windows Server 2012

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