Honor 6 (+other android devices), poor other sounds quality during VoIP call

Hello, ive got curious problem. During VoIP call (WhatsApp) all other sounds, like from YouTube, Spotify or any media player, sounds terrible. When i stop WhatsApp call, sound switch to normal quality and everything is allright. After call is connected, other sounds goes again very bad. Im using stock android 6 rom (B820). I've had the same problem with LG G3 with stock android 5, after android 6 update problem did solved. I've had no problem like this with my old LG L90 with any stock or custom rom.

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