Loss of Network Connection

Hi all, I’ve been having a few problems with my connection to Navision (SQL) when I do a medium sized process i get the message “The servername is no longer responding…” Thing is the server is fine, my network connection is fine. I am running Win XP pro (SP1) on a HP laptop nx7000 which has realtek RTL8139C + FastEthernet NIC. Drivers are the latest. My finsql.exe is 03.60.00.12033 If I ping the box with a ping -t whilst I run the process that drops the connection it stay at max ttl and never loses a packet. Anyone else had a similar problem? No one else in my team has the same problem. Any help appreciated, The server room is too cold to work from! Cheers Tony