Wait event SQL*Net break/reset to client caused by duplicate insert?

Hi,
Oracle 1.1.06 RAC on OEL 4 64 bit.

We are seeing an insert statement reporting "SQL*Net break/reset to client" as over 1/3 of its time.
On the face of it this event suggests network issues but nothing else backs this up as the cause.
So I looked at the Java code in question and a trace of one of the sessions.

What is happening is that an attempt is made to insert a row, most of the time a duplicate error results, the code catches this exception and does an update.
I was wondering if its the duplicate error and the exception handling which results in this wait event showing up.

All insights welcome

Regards

Pete

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