Why is text notification (vibrate) happening so often?

[AC Question]

My phone (Galaxy S6) is on silent and a text comes through. An initial vibration occurs to indicate a new text. The vibration then happens every minute unless I read the text. How do I change the frequency of the notification?

 

[B. Diddy]

Welcome to Android Central! Go to Settings>Accessibility, and see if the Notification Reminder setting is turned on.