VM freezing....anyone know why?

My environment is four HP servers with 256 GIG RAM in each server, 20 cores each server and 6TB internal storage on 15K RPM SAS drives, all running Windows 2012 R2 and a Windows 2012 R2 Domain.  Hyper-V is the Hypervisor and each host runs two to three VMs.

One of my VMs is a Windows 2003 server and it is a file servers for the staff of a school district.  The VM is given 8 gigs RAM and 4 cores and it has a C: drive and an E: drive.  The E: drive holds the data.

About every three days or so (it's random) the servers sort of freezes and users can no longer access the network shares.  All they get is a spinning mouse and their files will not open.  When I check resources, the RAM, proc, disk usage and NIC are all excellent.  I can detect NO load on the machine at all.  However, every few days, I still get the "freeze" and users cannot access shares.  The only fix I have thus far is to reboot, and it takes FORVER to reboot.  

I have looked at this a few times and cannot determine why it's freezing.  Can anyone suggest some places to start looking?

Thanks

Cliff
crp0499CEOAsked:
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JohnBusiness Consultant (Owner)Commented:
It could be many things including a damaged operating system. Try running System File Checker (SFC /SCANNOW from an admin command prompt).

Does the primary drive for the virtual server have enough disk space? Running out of disk will do this.
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crp0499CEOAuthor Commented:
John, you replied so the points are yours.  I found that an end users was running SQL backups from within an application on SLQ files of 30GB.  All SQL backups exactly corresponded with the times the shares went offline.  I'm adjusting the SQL backup times to off hours.  :)
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JohnBusiness Consultant (Owner)Commented:
Thanks for the update and I was happy to point you in the right direction.   Thank you.
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Windows Server 2012

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