Strange Irregular DNS/Networking Problems

I have been experiencing some very strange networking problems for a while now.
This has been ever since moving to Vista workstations and Server 2008 domain
controllers as I had never experienced it prior to this.

I have roaming profiles with the profiles stored on a DFS share. Everything
will be working as normal and then all of a sudden everything will hang and
stop working on the workstations and the server. I won't even be able to use
the start menu. If I click on start and then try to open the documents folder
the start menu will just stick where it is and get pailer and be unusable
from that point. Word will hang and most other applications will also hang.
I will then get errors about the network path not able to be found.
This error occurs on all the machines at once including the domain
controller if logged on via a domain account.
Sometimes the network will start slowing down before it stops working and
sometimes it will just suddenly stop. No errors are logged in event viewer
and I cannot see what is causing this. When it slows down opening up the
documents folder will take ages with the green bar at the top of the window
going very slowely and local file copies will go rediculously slowely and
take ages.

I have already changed domain controllers, replaced the network cables,
replaced the network cards, updated the ethernet drivers, replaced the
switches and router and cannot think what else to try.
All the entries in DNS appear to be correct.

Some applications force this network problem to occur straight away, one of
which is opening Firefox 3 (firefox 2 did not cause the problem).
Other applications seem to cause the problem to gradually occur, one of
which is working in FlashFXP. Everything will slow down gradually to the
point at which it stops after around half an hour.

When not using these programs then the problem may not occur for weeks but
for no apparent reason will suddenly occur.

When either using an XP machine or not using a roaming profile this problem
does not occur.

Does anyone have any suggestions of what I could try next?
I have done some research and found out about a new feature in Vista called
chimneying which it says can cause network issues by incompatible networking
equipment. It seems to be to do with dynamically adjusting the flow rate of
network traffic.

Thanks for any help.
Robin
.

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