Loss of network connectivity at random times to guests and now hosts Server 2012 R2 Hyper-v on Dell R620...Guests virtual disks reside on a NAS.

We have set up 2 Hyper-v environments (Server 2012 R2 fully updated) on Dell R620's. The guest machines are configured do that they reside on a NAS (also a Dell R620 with server 2012). We are having an issue on both the environments where the guests will
lose network connectivity. The servers ran well for about 4 weeks and recently the guests started having issues and we have even had to reboot the host due to network connectivity problems.
We have 4 virtual switches set up. 1 connected to its own NIC. 1 for management and the 3 others for guests.
The 3 for guests are not configured to allow host OS sharing.
We do not have IP addresses on the NICS for the guests. Only on the management port. (all 1 GB NICS)
We have updated the firmware and drivers for the standard Broadcom Netxtreme cards.
We do not have Jumbo frames enabled because of some issues with switching compatability.
I've seen articles recommending to turn off TCP offloading and to disable virtual machine queues. Is this best practice?
Any thoughts of where I might look to help diagnose this issue?

Hi ,
"1 connected to its own NIC. 1 for management and the 3 others for guests."
Also you mentioned that : " is only hosting these 24 VMs ".
First please try to disable the RSS in the property of the NICs for guests .
Then run powershell " Get-NetAdapterVMQ " to check the parameter "NumberOfReceiveQueues"  (NumberOfReceiveQueues – The number of queues that the NIC has available to use and assign to VMs,
the host and a default queue) .
If I understand correctly ,when you enable VMQ  the number of connected VMs on that NIC should not be more than the value of  "NumberOfReceiveQueues" -2 .
For details please refer to following link:
http://blogs.technet.com/b/networking/archive/2013/09/10/vmq-deep-dive-1-of-3.aspx
Hope this helps
Best Regards
Elton Ji
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