Inbound connection timed out related to free buffer waits?

Hi,
  I've observed a couple of 'Inbound connection timed out (ORA-3136)' 
during instance was suffering from 'free buffer waits' .
Thats because our RAID5 configured storage can handle like 100MB/s write 
bandwidth tops and we are doing heavy imports and FTS in the same time 
(warehouse type load).
But still not obvious reason why I'm observing ORA-3136 during that period .
CPU load is like 25-40% shared pool is in good condition , I was trying 
to figure out how
new session can hang during authentication phase  because of 'free 
buffer waits' and only conslusion was, maybe aud$ related
blocks was not able to' reach' db cache and take inserts session logon 
related.
Looks promising but audit is on OS level not in DB aud$ table :), 
besides default timeout is 60sec in 10.2.0.3
so hard to believe that 60s is not enought for doing that.

So, any other reasons for ORA-3136 I should consider ?
Regards
GregG




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