I had this same randomly-occuring problem. After failing to diagnose the problem with Samsung support, Samsung sent out an on-site service. I could not make the on-site service meeting because I had to be in the field. So I showed a friend the problem and how it was going off with loud sounds (door shutting, bass from TV, etc). She stayed at my apt to show the technician the problem, but could not recreate the notification without me in the apt. When they called me and told me they could not get the notification to go off, i realized my phone was the source. I had previously turned off/deleted the Smart Things app based on the little info I could find in these forums, but never did a restart on my phone. Once I restarted the phone, all was well again and the notification hasnt gone off since. The old Windows fix was the key.
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