DATABASE DISCONNECT ON AIX

Hi,
One of client are running oracle817 on AIX5 with perl and apache.Time to 
time we have been noticing "DATABASE DISCONNECT" issue with applictaion.the 
ping,tnsping looks ok between applictaion box and DB box.I only seen less 
SGA and couple of performance issue like memory leakage and 80 to 100mb 
memory free.the SGA allocated to 170mb which is I'm thinking is less.
What could be reason?
any suggestions and thoughts are welcome.
thanks
-Seema

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