Here is the website,

http://www.ekko.co.nz/

Randomly it brought up this error, and now it says

Forbidden
You don't have permission to access / on this server.

My client has only used the CMS and said things began to get a little bit weird.

The .htaccess file seems to be fine as I took one from another working silverstripe install and it didn't change it.

What could be causing this? all of the files are still on the web server... I just can't access anything??

It was probably something on the hosts end. Maybe they where doing updates.