Frozen Slider on Iphone

Every so often I check my site strikingnote.com on my iphone and find the homepage slider is frozen on the last of three images, with the text from all the three images superimposed on each other. This can be corrected by clearing history/website data in Safari. I am using the latest IOS on and iphone 5. The problem does not occur on other devices I've tested. I have a screenshot if it would help. Any ideas what is wrong?