"save as" closes down the Excel program

I am using Excel to hook into a prog called DOCSOPEN, which resides on a network server. I have a WIN2000 workstation and when I try to save a file natively, it saves the file, but shuts Excel down too. As I do create rather large spreadsheets sometimes, I like to save while working, but the fact that Excel closes every time is frustrating. If I do a "save as" to the network, it functions as it should. Only the native save as closes Excel. Any help is deeply appreciated.