My artwork portfolio has a strange issue which has just started happening all by itself, where some post thumbnails are not loading correctly. The strange thing is that sometimes they load and sometimes they dont. If you reload the page it changes each time.
I am using a portfolio template which I have had customised through freelancer.com as I am not a wordpress programmer.
The address for the page that is having problems is http://kitwebster.com/category/news/
On one instance, an 'internal server error' appeared.
The wordpress files are all stored on a server with the company http://www.ventraip.com.au
Im wondering if anyone can identify what could be happening here and give me a few options for fixing it?