I noticed the other day that my website www.motoragolf.co.uk was not working properly. The website has not been updated or changed for a long while and for what appears to be no reason the entire catalog of products fails to load. 

When I republish the catalog and its subpages, then the website works correctly again and everything loads as it should, but after a short while (20-30 mins) the catalog disappears again and so the problem goes on.

Any advice would be greatly appreciated.