Nexus 5 Sound notification pop-up

[Ruben1515]

So I just got my nexus 5 and this is happening all the time while playing a game, browsing the web etc.

Spoiler

Everytime this opens it makes a blip sound.
When it happens in an app it closes the app and goes to my home screen.
Anyone knows how to fix this?


Kind regards,
lnVader

 

[Ruben1515]

Another example http://i.imgur.com/5cRfXIQ.jpg

 

[shahbaz200]

Do you press volume buttons?