Form churns with no action between submission button and PayPal portal

I'm getting a lot of complaints our form doesn't work. Across different browsers several users say it stalls after hitting the submit button with no next step in PayPal. It does function correctly, as I've tested it several times successfully. It's just not reliable for all users. Ideas?

Thanks,

Graham Cox, cox@sctennis.com 

https://form.jotform.com/62774024870155 

Is your form embedded in a webpage? If that is the case, could you share the URL of the page?

If not, can we try submitting your form to reproduce the issue?