System.AccessViolationException from Oracle.DataAccess.Client.OpsSql.Execut

We support a VB.NET application which uses Oracle Data Access Components (ODAC) 10.2.0.2.21 to access an Oracle 11g database. The database is on another server, so from time to time application loses its database connection because of comms failures. To cater for this eventuality it checks for a valid connection before every database call and reopens the database if it can’t find one. This works, but subsequent database calls fail and return a System.AccessViolationException.
Here is an extract from the trace.
2010-09-08 17:08:42,284 ERROR - Database connection lost. Oracle.DataAccess.Client.OracleException ORA-03135: connection lost contact
at Oracle.DataAccess.Client.OracleException.HandleErrorHelper(Int32 errCode, OracleConnection conn, IntPtr opsErrCtx, OpoSqlValCtx* pOpoSqlValCtx, Object src, String procedure)
at Oracle.DataAccess.Client.OracleException.HandleError(Int32 errCode, OracleConnection conn, String procedure, IntPtr opsErrCtx, OpoSqlValCtx* pOpoSqlValCtx, Object src)
at Oracle.DataAccess.Client.OracleCommand.ExecuteNonQuery()
2010-09-08 17:08:42,377 [5] ERROR xxxxxxxx [(null)] - Database connection established.
2010-09-08 17:08:42,440 [5] ERROR xxxxxxxx [(null)] - ERROR - error in xxxxxxxx. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at Oracle.DataAccess.Client.OpsSql.ExecuteNonQuery(IntPtr opsConCtx, IntPtr& opsErrCtx, IntPtr& opsSqlCtx, IntPtr& opsDacCtx, IntPtr opsSubscrCtx, Int32& isSubscrRegistered, OpoSqlValCtx*& pOpoSqlValCtx, String pCommandText, IntPtr& pUTF8CommandText, IntPtr[] pOpoPrmValCtx, String[] ppOpoPrmRefCtx, OpoMetValCtx*& pOpoMetValCtx, Int32 prmCnt)
at Oracle.DataAccess.Client.OracleCommand.ExecuteNonQuery()
Has anyone come across this before? Any help will be gratefully received

Try posting this to the ODP.NET forum.
You might need to flush out the connection pool, but they can help you with that.

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