Oracle Database Diconnection with VC Application

Hi,
We are facing a major issue in our application such as the Application shows customized error as "Connection to the database server is disconnected" and terminates the application abruptly. The error pops up sometimes immediately after opening the application or after a period of time.
I cannot able to figure out how the error is coming. Application is not generating any logs.
The application is built on VC and it has two tier architecture. Application uses the Oracle tnsnames and ODBC Connection to connect to the Oracle Database.
I had done some basic analysis for network availability such as i opened the Oracle Sql*plus and our application simultaneously on the client machine (Windows XP). But application was disconnected with the above mentioned error and sql*plus working normal.
I have also done by switching on connection trace in the sqlnet.ora file. But I can't able to understand the trace file as it has no "null" named entries for connection values.
Whenever the Application is closed abnormally its leaving the ACTIVE session as INACTIVE. Then, I'm killing the oracle sessions manually using ORAKILL.
Please provide some pointers like how would I log the exception information if any exception is raised in oracle database. Depending on that log information i like to back track the issue.
Oracle Database Environment Details*
OS : Windows 2000 Server (SP4)
Oracle Database : Oracle 8i Enterprise Edition (8.1.7)
Please revert in case of any further information is required.

@SomeoneElse
Its happening from the beginning say two or three times a day. But from last two months the problem is very often (once per 15mins). User can't able to work on the application.

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