Running a fresh installed Server 2008 R2 Standard (x64) with SP1 as a single HyperV host. This server has to replace an "old" 2008 R2 with a couple of HyperV VMs stored. After shutting all guest systems down I tried to copy all VHD files to the new server. Unfortunately after a couple of minutes the system freezes and I have to reset the machine. It's not possible to ping the machine until a reboot has proceeed. CPU, RAM, RAID, Drives are in good shape and have been stress tested for 48h. Each component of the server has been changed with new hardware.
The server has two Intel 82574L GBit network cards (onboard). I removed the virtual switch for HyperV and tried the copy process with both ethernet connections individually.
There are no warnings or even errors in the event log