vw golf 7

[picf16]

Hi
Sometime Radio of vw golf 7 appear that there is no sound but radio work and everything is perfect but the only thing that ( THERE IS NO SOUND ) is there any update or and CD can solve that fault ?
any procedure ? thanks
radio skoda that get this faults : rns 310 - rns 510 - rns 810
radio types :
HARMAN
Columbus
Bolero
Bosch
etc..
any help please
thanks

for example

[kamold]

Is it under warranty?
I would be going back to the dealer and getting them to look at it.