Apache not responding for wordpress

We are running a apache server on google cloud. Below is the server spec

Machine type : n1-standard-1 (1 vCPU, 3.75 GB memory) CPU platform : Intel Ivy Bridge

I have hosted a wordpress customize template on above server. After some time site is not loading even though apache2 is up. Below is the memory usage of the server.

Used command is:

root@web-live:/etc/apache2/mods-available# ps -ylC apache2 | awk '{x += $8;y += 1} END {print "Apache Memory Usage (MB): "x/1024; print "Average Process Size (MB): "x/((y-1)*1024)}'

Result obtained:

Apache Memory Usage (MB): 11620.8
Average Process Size (MB): 46.2979

Command:

root@web-live:/etc/apache2/mods-available# free -ht

Result obtained:

             total       used       free     shared    buffers     cached
Mem:          3.6G       3.0G       601M        32M        56M       424M
-/+ buffers/cache:       2.6G       1.1G
Swap:           0B         0B         0B
Total:        3.6G       3.0G       601M

This is my mpm_prefork.conf

StartServers 5 MinSpareServers 5 MaxSpareServers 10 MaxRequestWorkers 250 ServerLimit 250 MaxConnectionsPerChild 0

I have clread the logs when this issue hapends first time and restarted the apache and waiting for the next occurance of this issue to extract the log files. But now I can't see any logs at /var/log/apache2. Can anybody provide a solution for this not responding issue?

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