I currently have a problem with an MS Access front end / backend databae between two servers running on a Hyper-V 2012 core server.
The database opens quickly but browsing the data running queries eventually caused Access to crash "Not Responding".
I know neither of the servers are at fault as if I acces the same backend data on a physical server it works as expected and if I use a physical PC or Server to run the front end with the backend virtual this works also.
The problem only exists between 2 virtual Hyper-V servers. All other applications work fine on the virtual machines and network speeds are stable with data copy speeds around 2.6Gb/s.
It appears only network related when both source and destination network adapters are virtual.