Why doesn't my message reminderd work (anymore) on the Galaxy S6 Edge?

[AC Question]

Message reminder does not work (anymore) Galaxy S6 Edge

I have a problem with the message reminder on my Galaxy S6 Edge.
After installing the phone from the box all worked fine. Then suddenly message reminder stopped working despite all the settings are correct. After a complete reset (factory settings) all worked fine again for a few days and now again message reminder is not working.
What could be the course????

 

[GJ Kim]

I think the downloaded apps for message is a cause. Which apps did you download?