apache 2.2.15 not responding some times in RHEL5.5

I am using apache 2.2.15 in RHEL5.5 and its not responding some times, whereas service is up and running and I didn't see any intermittent server restarts in logs,
please help me out to fix the same,

Thanks
taasAsked:
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Dushyant SharmaConnect With a Mentor Commented:
you can try various combinations of netstat command and put them in script and run using cron. otherwise give a try to zabbix
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Dushyant SharmaCommented:
run top command and check the apache threads for any continuous cpu or memory usage. if it is not responding then it might be busy processing something unnecessary.
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taasAuthor Commented:
Thanks for replying. The system is hardly using  
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Dushyant SharmaCommented:
anything on the connectivity side? is that going ok?
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taasAuthor Commented:
That is also looking fine.  Interestingly if I restart Apache it works fine for sometime. Again it starts behaving eratic. Do you think we should try upgrading/downgrading
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Dushyant SharmaCommented:
that is an option you can try. also you can try putting some watch on the apache using some monitor program. you can also try some cron to monitor the tcp activities may be that can lead somewhere.
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taasAuthor Commented:
Do you know of some way to effectively monitor tcp activity, preferably from CLI
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