We are currently running Windows Server 2003 in our work environment, with workstations running both Windows 7 and Windows XP. I have several users who lose their connection to the server intermittently for no apparent reason. The connection drops and then reconnects, but because we have users connected to Quickbooks, and other databases on the server, the disconnect often causes their systems to lock up. I have certified the network connections and patch cords, and all certify for gigabit, so I don't believe I have a cabling issue.
Yesterday, I used LanTraffic V2 to test the bandwidth between several computers and the server. Sending traffic to the server, my tx throughput averaged 20k, despite the computer having a gigabit connection. This morning I ran the same test on the same computer and the connection averaged 746Mb/s. This has happened again and again, with the connection varying from 600-700Mb/s to 20-30 Kb/s. The network utilization does not vary significantly, so I cannot figure out what would cause such a massive difference in bandwidth. I appreciate any advice.