Unidentified alarm sound without notification

[katta72807]

I'm getting a sound and vibration starting at random with no notification appearing, so I can't stop it without restarting the phone. I close all open apps and it still continues. It has even started while I am on a call, which is so annoying. And it is only since I have moved to the S20.

Does anyone have any ideas on how to identify the app? I have no alarms set, no calendar event, nothing that I can identify. It has occurred a few times now.

The volume is controlled by the ringtone volume setting, but the sound is not a ringtone or notification sound or any sound setting.

 

[Rob]

Can you go to:
Settings > Notifications

And under "Recently Sent" tap "See All" and see if any of those apps could be the culprit?

 

[katta72807]

Thanks for your help, I tried looking at recently sent notifications but I had a few notifications around the same time so it wasn't clear from there.
I'm stumped as to how to stop it, but I'll know next time it occurs to look it up immediately.

 

[katta72807]

It happened again, 6 days after the last time. Nothing appears in recently sent notifications (the latest was 7 minute earlier). I've now installed Nice Catch.

I've identified the most likely candidate is Skype for Business that I use for work. It has its own audio. Still no solution but at least I think I know the culprit.

 

[rapidturtle]

I had a phantom notification, and found out that it was a setting in the phone, that lets you know when you miss a notification. It was set for all of my apps, and took me a little while to figure out. It drove me nuts for a while though.