Vista trying to connect to domain when not connected

I am using Vista Enterprise which is setup by my corporation and I don't
have access to all settings, some might be related to group policies
etc. It is using a "roaming profile".

When I am home (connected to internet but not to my domain) Vista
sometimes try to connect to the domain, for example when I open a file
open/save dialog causing computer to stop responding for a while which
is very annoying.

Is there any way to avoid this problem other than using a local account
when I am at home (which I don't like because of having to duplicate
settings etc). Any magical setting to make it understand that I am not
connected to doamin and to stop trying.

Magnus