I have two BitsyXb boards with the Ethernet personality boards. I have had nothing but slow network connectivity through the Ethernet port. When trying to debug through VS 2003, it will occasionally pause for up to 30 seconds. Most of the time I will get a disconnect after debugging for a few minutes. The weird thing about it is that the link light go out on the RJ-45 jack on the board. It seems as if the board shuts down when there is traffic on the port.
We would need some additional information about the build you are using. Can you please email us to support.us@eurotech.com and we'll make sure you get a reply within 1 business day.