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I checked your jotform http://www.jotform.us/form/51546649517161 and noted that it has a customize email notifier
the Notifier seems to be not updated anymore.
I suggest creating a new Notification Email for the form. using the Add New Email button in the Email Alert.
user guide: -Setting-Up-Email-Notifications
Let us know if issue still persist.
I changed nothing and it seems to be sending again. Will update if changes persist.
Thank you for letting us know that it seems to work now.
If the issue appears again, we suggest that you try creating a new Email Notification, as explained by our colleague Jonathan above.
Please let us know if you experience further issues. Thank you.