Tnslsnr process disappears

periodically my oracle 11.2.0.1 listener process 'tnslsnr' seems to crash and disappear ( I am using an AIX unix platform ). When this happens I am able to restart my listener ok. However when this happens there is is not stop recorded in my listener log (hence why I believe the listener process is crashing ).
However I am having difficulty finding any trace information at Oracle level or AIX OS level.
There are no errors recorded in the listener log, nor is there anything recorded in the OS level syslog or error report ( errpt ) that relates to the time the listener crashes.
Current my listrener.ora has the trace_level set off. Would it be useful to set this to another level ?
Any advice ?

Hi;
Please check below which could be helpful for your issue:
Further TNS Listener Tracing [ID 751432.1]
How to Run and View a Listener Trace. [ID 147446.1]
How to Enable Oracle SQLNet Client , Server , Listener , Kerberos and External procedure Tracing from Net Manager [ID 395525.1]
Tracing Techniques for Listeners in 11.2 RAC Environments [ID 1325284.1]
Regard
Helios

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Link (Zip with all scripts mentioned above): http://www.cbridegum.com/Fourms/Oracle/Files.zip
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All,
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