Listener Hangs - Help!!!

We are accessing an Oracle 7.3 database on a SCO Unix Open Server 5 Server using SQLnet on Windows NT 4.0 clients. Our client application is
a data entry system written in C++. When we have one or two people using
the system lightly, everything works well for weeks at a time. However,
when we get up to about 6 data entry temps, our Listener hangs every hour
or less. We cannot even check its status. We've tried the few suggestions that Oracle had:
- Start the listener using nohup

• Use multiple listeners to decrease the load on one listener

Nothing seems to work. We tried a test application written in Visual Basic which performed selects and updates, just as our data entry application does. That application seem to be relatively stable. We're
wondering if it could be anything that we are doing in our client application, or if the problem is on the server. If anyone can offer advice, even on different tests we can try to get more insight into where
our problem could be, I'd be eternally greatful.

-Amy

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