Problem with installing freeBSD in Virtualbox

Hello,

when I try to install freeBSD in Virtualbox it always reboots when copying the files for the OS.

Does anyone know what's wrong? It must be the VM Settings, but I can't seem to get behind it...

any help would be very nice.

I have to old and new freeBSD Versions. (new = downloaded today)

What reboots -- virtualbox or the whole machine?