The images are failing to load properly after clicking the F5 refresh button on most of our web pages.

The address of the site is http://www.pomonafruits.co.uk

If you click on a page (any page), the pictures normally load at first but if you click F5 refresh, random pictures start to go missing. Sometimes its the product pictures, sometimes bestsellers, sometimes the banners at the top or the Security Metrics & Comodo images at the bottom etc.

Sometimes just 1 image is missing, sometimes its 2 or 3 at a time.

Its happening from various computers (both Mac and PC) at different locations using various browers (Firefox, Google Chrome & IE).

It only seems to happen when you click on refresh.

I also get a lot of Error 403: Forbidden messages, not when refreshing but when clicking from page to page. Again they seem to be totally random.

The website was working fine and I only noticed this starting to happen a few months ago. I believe the 2 problems are connected as they started to occur around the same time.

Has anybody got any ideas?

Many thanks.