Has anyone experienced the same issue as me ? I usually put my phone into DND mode at night, manually when i go to sleep, and then manually turn DND off when i wake up. DND works well but after turning it off, I'm still not receiving any notification UNTIL the phone detects a network switch (ex: when i get out of my house, Wifi not reachable anymore => 4G kicks in), then all the missed notifications arrive at the same time (flooded ).
Any idea, people ?
To be honest I do not use DND as I prefer to turn my phone Off overnight and charge.
First try a soft reboot by turning the phone Off and On.
If this was me I'd first try clearing the phones system cache files by turning the phone off and then from a set series of button presses go into the phones system files and clear the cache. No info is lost this way.
If that fails then consider a factory reset as a last resort @anhdungle
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.