I have had this problem with a number of clients over the last months, after a bit of searching i found this

KB Number: KB974909
Title: The network connection of a running Hyper-V virtual machine is lost under heavy outgoing network traffic on a Windows Server 2008 R2-based computer
Description: This affects all guest operating systems.  The fix is applied to the hypervisor and while a reboot is required for installation, no updated need to be applied to the guest operating systems.
Link: http://support.microsoft.com/kb/974909

If you are seeing child virtual machines on Server 2008 R2 loosing network connections, then give this a try.

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Update, there is now an all in one link

Update for Windows Server 2008 R2 x64 Edition (KB2264080)

**Update** Problem now happening on R2 SP1. Link for more info

http://blog.greypuddles.net/?p=120

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