I've tried all things written in all forums to try and fix my apps notifications, but nothing seems to work.
I don't receive a notification from any app untill I open it.
For example if I open Viber or FB Messenger than I get the notifications, or if someone writes to me I get one notification not a beep for every message/row sent.
For example when you write to someone something and you click on send he gets a notification, and send again and he should get a notification again... but for 5-6 rows sent to me I get only one notification....
