The single.php is a WordPress file used to render content for an article/blog post. To my understanding, there is nothing wrong with you loop. Make sure you are using the latest version of WordPress and PHP to ensure everything works efficiently.
Mudasir Nazar, Tutorial Maker, Web Designer/Developer, Photoshop Designer, Thinker and a Creative Writer. With coffee running through his veins and being Tech aficionado, he loves blogging, Gaming & Teaching. Catch him on Facebook | Twitter |Google+