Yesterday Emulex announced a driver and firmware update that should solve these issues: http://blogs.emulex.com/implementers/2014/06/19/microsoft-windows-20122012-r2-hyper-vms-losing-network-connectivity-workaround/
As we can read in this blog: Status on 6/19/2014: Updated driver and firmware code that addresses the VMQ network connectivity issues is currently going through comprehensive validation and test and is estimated to be available for Emulex branded products by mid-July 2014. Driver releases of specific OEM configurations are being evaluated now. We will update this blog as soon as we confirm the timing and location of each OEM release.
That’s good news! Let’s hope that this update will be available as soon as possible and that this update will fix the VMQ issue!