Network Disconnection in virtual machines

I hae two Hyper-V servers installed on 2IBM 3650 Machines. I installed two Win 2003 on ach Hyper-V soin total I have 4 win 2003 server SP2
I noticed lately that most of my 2003 servers hosted on Hyper-V 2008 are getting disconnected from network for a while and after that their performance gets very bad for about 20 minutes.
I check the event logs and found the following warning

Event id: 5
Source netvsc
The miniport 'Microsoft Virtual Machine Bus Network Adapter' hung.

This warning is always followed by another information message

Event id: 4
Source netvsc
The miniport 'Microsoft Virtual Machine Bus Network Adapter' reset.

I monitored the disconnection and I found that those messages are appearing just when the disconnection happens. I searched the internet and I found a lot of discussions regarding this error but no exact solution is posted and nothing posted by MS too.
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have you tried re-installing the integration services?
The obvious:
Check for and install the latest updates to your Hyper-V host systems.
Reinstall/update integration services.

The rest:
Are you using legacy network adapters for your guests?  If you have integration services correctly installed, make sure you are not using legacy network adapters unless you need to PXE boot.

Although it is unlikely to be hardware, check any available NIC diagnostics on your host machines, and check your switches for any collisions, etc...

Were there any driver updates done to the NIC?  Are there any available?

Any potential disruptive software like AV, backup software, etc. that can be disabled to troubleshoot?

Does this occur on a fresh install of a VM with Win2003?
first_MCITPAuthor Commented:
After a  lot of trouble shooting I found that the problem is related to Symantec. I opened a case with Symantec but still they didn't replied with an exact solution. I will post the solution once I get it.
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first_MCITPAuthor Commented:
MS had releasd a new hotfix
I tried it but it didn't work
I tried also to change the Power Scheme; It seems that it worked but I want to monitor for few more days

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first_MCITPAuthor Commented:
Guys one ween had passed and i didn't get any disconnection, I think the MS patch had worked.
I'm getting the same issue on my ubuntu vm with issues of loss of connectivity .  Could this be related? screen1
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