My form is just hanging when users hit submit

I believe that you are referring to the form http://www.jotform.co/form/90768264372869 in your account. As I tried to submit the form, the form did not submit and hangs at Please wait. The issue seems to be on your form with the 'Appointment Slots' widget on the form. I have updated the widget and tried sending another submission which worked fine. Please check again and let us know if you need any further assistance. 

Thanks!