nav_linux

Hi I am using Intel e1000 ethernet driver and the system is used to netboot a diskless external control box. We download the OS on the diskless box using tftp. I recently noticed that the OS download hangs after starting and almost finishing 50% of the download. My system configuration on the host is GigE port and the diskless has a 10baseT port which is connected with a switch in between. The confusing thing is that it works sometimes and randomly fails. Once I get into the failed mode, I have to reinstall the e1000 driver to get it to a working state. Any clues or ideas. Is there some setting that I can use to work consistently ? Thanks