Two Sessions Waiting for One Another Across DB Link

Hi,
Version: 9.2.0.8, patchset 8
OS: Windows Server 2003
Server: Itanium 2
During our overnight ETL process last night, one of the stages which normally takes serveral minutes to run became stuck. The calling process in the DW database was showing as ACTIVE and the wait event was for "SQLnet message from DB Link". When looking at the session in the database where the changes are being collected from, the session was shown as INACTIVE and to be waiting for "SQLnet message from client".
The process was stuck for 6 hours and until we managed to kill the job from the schedule so that the remainder of the ETL process could continue. There were no errors on either of the two servers (the DW and source DBs run on separate boxes). The network engineers reported 0 problems with the network at the fault time. There are no trace files or reported errors in the alert logs of either DBs.
Has anyone seen this type of problem occuring before? Or can anyone suggest possible causes/ways to determine what the possible cause was?
We have since re-run the offending stage and it completed within 5 minutes.
Thanks in advance

There was no answer from here or from Oracle. We use a different process now.

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