Directional light flickering issues with shadows

Questions
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1

I am trying to simulate sunlight using a directional light. In the process I am setting the size of the shadow camera values such that it fits the scene as tight as possible. However, I am facing a peculiar problem of light flickering at certain angles(when light behind meshes, occluded etc). Please refer to the attached picture below for an idea of the problem.

new-out

The below code reflects the settings of my renderer.

getARenderer():WebGLRenderer{
        let renderer:WebGLRenderer = new WebGLRenderer({ antialias: true, alpha: true, preserveDrawingBuffer: true });
        //set to false and clear manually. This is to make the viewhelper work
        renderer.autoClear = false; 
        renderer.shadowMap.enabled = true;
        renderer.shadowMap.autoUpdate = true;
        renderer.useLegacyLights = false;
        renderer.shadowMap.type = PCFSoftShadowMap;
        renderer.localClippingEnabled = false;
        renderer.outputColorSpace = SRGBColorSpace;
        renderer.toneMapping = ACESFilmicToneMapping;
        renderer.toneMappingExposure = 0.5;
        renderer.setClearColor(0x000000, 0.0);
        renderer.setPixelRatio(window.devicePixelRatio);
        return renderer;
    }

Shadow map size is the default value of 512x512 and Shadow map bias is -0.0005. The camera near and far values are 1 and 5000 respectively. I want to know what could be causing these flickering issues at certain camera angles.

Regards,
#0K