Peter, can you please give me a little more information. Which part or parts of the website are not working correctly and what are they doing? I need to be able to replicate the issue if possible before I can fix it. Also, when you have these issues what device are you using and which browser?
If you're using your phone or tablet, have you tried clicking on the Desktop Version button at the bottom of the page? The website detects mobile devices and reshapes the page to suit small screens.