RaiseException

Our Accounting Software uses SQL Anywhere Database running on a WINNT server. Our workstation uses Win2K and a client software to connect to the server via TCP/IP. We always encounter RaiseException error when we leave for a minimum of 15 minutes without working on it. The connection to the server disconnects after that time. What could be wrong in my win2K workstation? I tried it using win98 client and it works fine.