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Sound Notification Sound but no notification Jan 26, 2018

cfsett , Jan 26, 2018 :

I am getting frequent notification sounds, but no notification. Occasionally I will get two or more notifications one after the other, but I can't figure out which app is notifying. This started after the most recent Android update.

I've tried:
- Changing the notification sound on a number of my most used apps (like Gmail, Facebook, Skype, etc) so that each has a unique sound. Still get the default notification sound.
- Turning off NFC
- Turning off notifications from apps which feel I need to know what they want, but I really don't
- Ensuring running latest Android version

Still to determine:
- Might this be a full charge sound? Pretty sure it also happens when I'm not plugged in, but maybe it is the battery cycling to trickle charge or no charge, then charging back? If so, I can't find a sound setting for this.

I'd certainly appreciate any other ideas, or knowing if anyone is experiencing a similar problem.

Thank you in advance for your help.