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I would like to apologize for the inconvenience. Chances are you might have been logged out from your Account when you're saving the form. Also, this sometimes happens when the connection is slow and it's taking some time to save the form, especially when it's a huge form. Clearing your browser's cache might help. But what I would recommend for you to do, is save your form right away if you have made any changes. Pressing Ctrl+S from your keyboard saves your form when you are in your Form Builder page.