Blank subpages on android

Hi I'm having a problem with a clients website (www.tekstsprutten.dk/). 
I get a blank page on all subpages of the site on some android devices, but they load up nicely on my iphone. 

Any help, please? 

skiptomylou, looks like your website sometimes becomes very slow (there is no rule, the same page can be loaded fast and slow in few seconds), and subpages are not loaded because of connection is closed after a timeout.