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you should upgrade more RAM or try this: <br> <br>http://digitaloceanvps.blogspot.com/2014/04/best-configuration-for-512mb-1gb-ram.html
<b>“… what may cause this?”</b> <br> <br>Not enough memory… <br> <br>1.) Dump Apache, for Nginx (Nginx is lighweight). <i>See</i> <a href=“https://www.digitalocean.com/community/articles/how-to-install-wordpress-nginx-php-and-varnish-on-ubuntu-12-04”>How To Install Wordpress, Nginx, PHP, and Varnish on Ubuntu 12.04</a>; <br> <br>2.) Add swap. <i>See</i> <a href=“https://www.digitalocean.com/community/articles/how-to-add-swap-on-ubuntu-12-04”>How To Add Swap on Ubuntu 12.04</a>; <br> <br>3.) Add MySQL caching. <i>See</i> <a href=“https://www.digitalocean.com/community/articles/how-to-install-and-use-memcache-on-ubuntu-12-04”>How To Install and Use Memcache on Ubuntu 12.04</a>; <br> <br>4.) Create a CDN for static files. <br> <br>5.) Install the <a href=“http://wordpress.org/plugins/w3-total-cache/”>W3 Total Cache</a> plugin.