This site Frequently can’t be reached

I’m new to drupal.

My site is site Frequently  can’t be reached.

I checked my MySQL database and Process Explorer via Microsoft Sysinternal.

They are doing fine. 

CPU utilization is 1.5%-3%

RAM utilization is 28% out of 12GB

PHP memory_limit = 256 MB

By the way, I’m running Apache V 2.4.23 Win32 and PHP V5.38 32bit.

Please help me pin point of what to login for because all of components are up, but site can’t reached.

Thanks,

Marin

Drupal version: 


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