White screen - erratic

Hi All,

I have used the sporter template for a site, but keep getting a 'white screen' on the front end and backend. It does not happen all the time, sometimes the site loads perfectly and then it works great...
but most of the time (and more importantly when the clients visits it) it's white.

site is http://www.datshift4x4.co.za

PHP is up to spec... I assume it is timing out on something, but just can't find out what....

anyone got any ideas?

Turned out to be a conflict server side...