Hyper-V running under a fresh install of 2008 R2 DC

2 VMs both running 2008 R2 STD

One VM has SQL 2008 Server w/ SP2 and Office 2007 Enterprise w/ SP2

Othe VMS only Office 2007 w/ SP2.

Approximately 10 minutes after reboot the Hyuper-V host the VMs will hang

Hang = answers pings, but no RDP connections and Hyper-V console session is non responsive

Disabled Hyper-V and had no proble with 2008 R2 DC host.

Started the three Hyper-V services and 10 minutes later was hung again.

Hardware is HP DL380 G4 2 socket, 48 GB, Internal SAS controller 1.5TB C drive VMs .VHDs are on external SAS controller on a 1.5 TB RAID5 volume.

Nothing in event log on either VMs or Hyper-V host.

Ken