One of my blades which is running Sharepoint 2003 on Windows Server 2003 is losing network connectivity occassionally. It happens a couple of times a day but not for long. I updated the bios. I broke the team and then updated the drivers for the Nics and the team and reset up the team and still lose connectivity occassionally. I swapped out enclosures and get the same thing. If I turn off the enclosure and back on then it is good for a couple of weeks before it starts happening again. I had my network guys to check the logs on the Cisco router and there are no errors. I reseated the switches in the enclosure and it is good for now. Can you upgrade the firmware on these switches on the enclosure? Could this be related to collisions? I saw a post where people were changing the registry to increase the tcpwindow size but it was for intel cards. I am using broadcoms. Any ideas or has anyone else dealt with this?