My Galaxy s9 keeps making the notification sound and vibrating, but no notification is coming through. I swipe down to see my notifications and nothing is there. I still get notifications when something is actually coming through, but it just randomly makes the sound with no notifications.
So to be honest with you, I don't know what safe mode is. And I just searched for it in my settings and nothing came up. So I don't believe my phone is in safe mode, but I'm not sure.
This should help with safe mode:
1. Turn off the device
2. Now switch your phone back on. Immediately you see the Samsung logo appear on your screen, press and hold the Volume Down key until the phone boots completely to the home screen.
3. You should now see a watermark caption "Safe Mode" at the bottom left corner of your phone screen. This will now disable all 3rd party apps.