Why is my form not submitting and getting stuck?

4) a while ago two companies were filling out a survey (which takes ten minutes of their valuable time) but it wouldn’t submit (they didn’t tell me what the error message was).

Based on the description you have provided it seems like the form is embedded on a web page, please try replacing the current code with the iFrame code, this guide will help you getting it: https://www.jotform.com/help/148-Getting-the-Form-iFrame-Code 

If the problem persists, please share us the page where the form is embedded on so we can have a look on it. 

Looking forward to your response. 

Thank you for that iframe code info. I have never heard of that. I am no longer using the specific form referred to in this thread, but I will keep that iframe link for future reference.