[squid-users] squid stops working several times a day.

Hi All,
I have a problem with my squid's.
Squid "stops working" several times a day.
Although the process is up and running, our users get timeouts at port 80. When this happens even the telnet on port 80 stops working. With no error messages in log.
The only thing that warns me that something is wrong in cache.log is the
"Detected DEAD Sibling: xxx.xx.xxx.xxx" message.
After a few seconds everything goes back to normal.
We are using 5 squids version (2.7.Stable 9) in Accelerator Mode which are sibling to each other.
So we have 5 sibling squid in front of our web farms. Serving almost 7000/request per second at peak time, and an average of 4500/request per second.
The problem occurs randomly in all servers...

Could somebody Help me,
with what could be happening.

p.s.
Received on Tue Feb 28 2012 - 17:50:56 MST