Membership 2 Pro Automated Emails Being Sent Every 4 Hours!

Membership 2 Pro automated emails is set to send a reminder email that a customer's subscription will end in 5 days. On the day the email is set to be sent, the system sends the reminder email four times, once every 6 hours! Why is this happening and how do I get the system to send the email only once? Support Access is on, can somebody take a look? Thanks.