Why are contacts getting multiple membership scheduled reminders?

Question

We saw this with a WordPress 4.4.2 CiviCRM 4.6.14 instance.

A reminder was sent every time cron was run.

This is not related to Why is Scheduled Reminders sending multiple emails but not creating an activity? an activity is created every time a reminder is sent.

Answer 1

This is a bug as reported here - when a membership end date is changed the system keeps sending scheduled reminders.

The issue is fixed in 4.7 but remains for 4.6