Curious if my solution fixed your disconnect issue.
I do not know what the difference is between the two interfaces. I was originally told they are identical. As you can see from my earlier post my experience in my lab says otherwise.
I do know that if you purchase an appliance instead of using the VM image there are two physical ports. The LAN interface defaults to using DHCP while the Management interface uses static IP. Otherwise I am not aware of any difference. Maybe someone else can chime in.