Notification problem with my Viber, telegram, WhatsApp and ...

[audi360]

On my Lumia 930, I do not receive notifications for these messaging apps. I get notifications for other apps such as age of empires.
Could anyone help solve my problem.
The person who solves it has my ever lasting gratitude

 

[Andrew Alekseenko]

The same thing. I can see notifications only then I turn phone on manually. But from time to time notifications works..
I don't understand what happening. In settings notification is on.

 

[Arindam Mukherjee1]

notification not coming or whats app in my lumia 625..till i dont open it manually