Linux httpd is down sometimes

Sometimes my all sites are down i am checking cpu, ram and everything is ok
but when i counnect my machines screen i see that
empty swap = 0
what could be the error , how could i solve this ?
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CahitEyAsked:
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bouguiConnect With a Mentor Commented:
Maybe your server is out of swap space,

Type this cmd:

free

And send the output

Bye
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nabeelmoiduCommented:
can u be more specific? attach a screenshot perhaps?
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