iSaumya on "[Plugin: WordPress MU Domain Mapping] Sometimes pages just keep loading"

Dont know why, sometimes when accessing the site it just keep loading endlessly. See here: http://prntscr.com/38sol5
Again if I do a refresh (F5) its loads perfectly. Why this is happening?
I'm using wp 3.8.2 and also the development version of sunrise.php ans stated on other comments.

https://wordpress.org/plugins/wordpress-mu-domain-mapping/