Double sound - notifications

[Burnago]

Hello.

I have a problem with my galaxy s4. Thing is very simply and complicated at the same time.

When I get sms or new email I hears double sound. Is something like i got two messages in one moment. I turned off and turned on my device but I dont see any changes I tried to use different music but problem didn't disapear.

Anyone had it earlier? How can I fix it?

I don't have rooted phone.
Android 4.3 - no branded.

 

[Burnago]

I gotta another informations of my problem. Maybe it will help to solve it.

I turned on Air gesture and enable quick glance. Everything would be ok but when im using this function and screen turning on to show informations - IS TURNING ON SOUND OF NOTIFICATION TOO.

And one more. Cpu Spy shows, my device is not going into deep sleep completly.