How can I turn off the notification sound that comes on my S8 with no notification or alert message?

[AC Question]

My galaxy S8 is doing sound notification constantly without any alert or notification message that exist. I accessed in the settings>>accessibility , the reminder is turned off. Moreover I turned off all my apps notification and the notification sound is still coming constantly.
Please HELP.

 

[Leslie Hatcher]

mine does this, too and I have not figured out how to stop it