Intermittent Hyper-V Switch Failure

Today is the third time in five months I’ve had this issue, and any help is appreciated.

Hyper-V Host HV1 has two VMs, DC1 and APP1.  DC1 and APP1 use a Hyper-V switch to connect to the LAN.  Host and VMs are on the same subnet.  

Sporadically, the guests lose the connection, cannot ping each other, or the host, or their default gateway.  

The only solution I have found that works is to shut down the VMs, remove the virtual network adapter, delete the Hyper-V Switch, then build a new Hyper-V Switch using the same NIC on the host (the host only has two on board NICs, plus iDrac.)  Then assign
that to each VM and boot the guests to their OS.  That works, but it then crumps again a few weeks later.  

Tidbits: DC1 is Gen1 VM, while APP1 is Gen2 (DC1 is Server 2003, if that matters… Don’t ask why, it’s a long story… and APP1 is Server 2012 R2 Standard).  
Host is Server 2012 R2 Standard
HV Manager is 6.3.9600.16384
Host is up to date on firmware from vendor website
Host is fully patched with OS updates
Dell’s built in hardware diagnostics show no problems.

I can get log files, if you wish.  

Any help or ideas is _greatly_ appreciated.



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