connecting local devices RDC freezes

hi

we use RDC by choosing the option under *Local Resources:
Connect automatically to thes local devices when logged on to the
remote
computer. We use Mac OS 10.3.5.

The problem is, sometimes, the local devices are connected to the
windows
2003 server and sometimes they are not. if they are not, RDC freezes
and
we have to force quit the programm.

If it works and the local devices are connected, the programm works
fine.

We have this behaviour just sometimes. we have tried to find out, what
the problem might be, but couldn't find anything.

we have rebooted the powerbook, printed before connecting to windows
etc. nothing helped so far.

any help is very much appreciated.
thanks
bettina