Easy Fancybox crashes Apple Devices

I have used and installed Easy Fancybox a number of times and never had problems but for some reason it’s causing any Apple device I test on to break.

The page loads fine and I click an image, the lightbox appears ok and no issue. I click the ‘X’ or anywhere else and it closes fine. But then the website stops responding, I can’t click another image or even button etc on the page and if I hit refresh on the browser it takes ages and times out.

Anyone got any ideas what it could be? I’ve disabled Plugins and jQuery and still happening…

Thanks