Android libgdx freeze on sound.play()

I'm getting a 0.5-1.5 sec freeze when calling sound.play() first time. Seems that problem appears only on galaxy alpha (4.4.4), works fine on galaxy note 10.1 (4.1.2) or custom-china-phone (4.2.1).

Also, lag appears only on first launch after idle of device for 10-15 minutes: if i launch game right after first launch - everything works fine.

Thats how i load and play sound:

public void init(AssetManager assetManager)
{
    this.assetManager = assetManager;

    assetManager.load("sounds/jump.ogg", Sound.class);
    assetManager.finishLoading();

    jump = assetManager.get("sounds/jump.ogg");
}

public void jump()
{
    if (assetManager.isLoaded("sounds/jump.ogg"))
        jump.play();
}