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Is this the form that keeps crashing http://www.jotformpro.com/form/52806812078963?
I was able to replicated mentioned issue when I tested that form.
After that I have cloned your form and conditions that you have set inside of your form are causing this issue. You are trying to pass values from all of you matrix table field options to same matrix field and you are also using calculation to multyply vales in same matrix field. This is causing conflicts inside of your form and because of that your form is not working.
I would suggest you to check conditions that are set inside of your form and to set them correctly. If you want to perform calculation inside of your form this guide can help you:
And inside of this guide you can find out how to perform form calculation in the Matrix field:
Hope this will help. Let us know if you need further assistance.