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Hey Tara, if these reminders are coming as alerts from Marketo, you can track down the campaign that is sending them. You want to go into the lead record of one of the leads that alerts are being sent for. In the Activity Log, you can view the alerts sent, and all the way in the right column it will tell you the associated smart campaign that caused the alert to be sent.
That would be the first thing that I'd do to try to figure out why alerts were going out.