Default [Q] Help please my S4 is giving notifications without notifications being present

All,

My S4 non-rooted stock Mk2 has recently started playing the notification sound and vibration without there being an actual notification in the bar. No New e-mails or texts are coming in when this happens and nothing new in the apps being updated.

How can I track it down? It appears at random times not on any discernible pattern.

I'm pulling my hair out looking for what is causing this. Has anyone else seen this kind of behavior? Is it app related? If so what app?

I have Facebook notifications turned off, and I've not installed any new apps around the time this behavior began.