What are these new random notification chime sounds about?

[AC Question]

In recent weeks, Galaxy Core Prime phone I've had almost a year recently began giving out a same new, unexplained, notification chime at random times, day or night. I can't discern what it even means. The chime itself is a sound not present in the installed group of available chimes. Nothing shows up in expected place where system notifications normally display. It definitely does NOT reflect any texts, missed calls, nor blocked spams. None of my phone's settings or preferences seem related. Any readers out there have info on what this chime means? Or how to disable it? Thanks in advance!

 

[zocster]

Sounds like NFC? Try turning that off?

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