No, nothing to do with how much bandwidth the remote client takes - but a warning instead.

It seems that copying data from the host machine to the guest OS - via the ‘external’ network adaptor, kills the machine. The whole machine. Including the host. Yes, our SMS server experienced it's first (and second) “System was unresponsive” shutdown state! .
And the second time - well I had to make sure that it wasn't just some fluke and that copying the data really did kill the machine .