i noted the following errors , i dont know if it is the major issue !
*squidaio_queue_request: WARNING - Disk I/O overloading
2013/02/28 14:09:34| squidaio_queue_request: Queue Length: current=2617,
high=2804, low=721, duration=20
2013/02/28 14:09:40| fqdncacheParse: No PTR record for '221.181.104.19'
2013/02/28 14:09:40| fqdncacheParse: No PTR record for '221.181.104.19'
2013/02/28 14:09:41| squidaio_queue_request: WARNING - Queue congestion*
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