Issue with Hyper V

I have a VM running in Hyper V on server 2008 R2.  The VM seems to lose it's network connection, but there is no network interruption on the host server.  OF course it's a critical service, our SharePoint server.
nsca_mitchAsked:
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OriNetworksCommented:
What problems are you experiencing that leads you to believe it is losing its network connection? Is this the only VM on the host? Do you know if the host is losing its physical connection? Anything in the events logs for the VM?
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nsca_mitchAuthor Commented:
The host is not losing network connection, there are 3 other VMs and they are running fine.  I checked the logs in event viewer on the Host and the VM and see nothing to indicate a problem.
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OriNetworksCommented:
What symptoms are you having that make it seems like it's losing connection?

-Maybe are you using remote desktop to connect and it disconnects with an error message?
There may be resource bottlenecks of a physical network issue.

-Are you simply trying to access the sharepoint site and it takes a short delay before loading?
If this is the case it is normal behavior for a .Net site to recompile when it is first being accessed after a restart/recycle. OR whatever server is being used as the sql backend may be having issues.

-If you are on a different network such as trying to access that server from the internet, you would have to verify with your ISP that there arent any router/bandwidth issues.
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nsca_mitchAuthor Commented:
The SQL server (VM) loses contact with the SharePoint server and I can only access it through the host machine.  As soon as I log in it has a caution sign on the network icon in the task-bar, when I reboot it is a solid icon and it reconnects.

The host has always had a good connection.

My ISP has already opened the firewall and such to access from the Internet.  That isn't an issue as long as the SharePoint server can connect to the sql server.
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nsca_mitchAuthor Commented:
I even built a new VM and connected to the existing virtual HD and still have the same issues.
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OriNetworksCommented:
So the Sql server vm is the one that is losing the connection and has the caution sign on the network icon?

When you try to reach the sharepoint site, what error do you see?

On all servers try checking the time when this problem happens to make sure it isn't failing authentication due to time differences. That is a common problem with VMs.

Also it may be worth reading this article. While they finally found a network hardware issue, other post have good solutions for the same problem in particular a hostfix from microsoft as well as modifying TCP Offloading within the VMs. http://serverfault.com/questions/278860/why-are-my-hyperv-vms-randomly-losing-connectivity
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nsca_mitchAuthor Commented:
Followed directions form the article, checking to see how long it will stay up.
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