Error when saving a new incident:
Error when evaluating Calculation Rule for Incident.SendSurveyNotifcation.
Attempted to divide by zero.
Contact your system Administrator
Setting the global constant for the survey frequency to zero would trigger this behavior.
Surveys are sent if the modulus (the remainder) of the incident number divided by your global constant are zero, meaning there is no remainders.
You can't disable the rule due to how it was built.
You can, however, disable the Workflow that fires when 'SendSurveyNotification' is set to true. This will completely stop the surveys from going out. You can re-activate the workflow at any point to start them up again.