Oracle/Solaris

i had one big OLTP environment running on Solaris 10 with 256G RAM and 30+ CPU. 
There are sometime in a day when all OS command are totally freezed. Even ls 
command take several minute. CPU was showing more than 60% idle. If I am 
connected to database, then call to check Db like locks or other query works 
fine. What can be the issue to be checked more closely. Also Application trying 
to connect from outside are affected.
TIA
Sanjay


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