Shake Device on Orientation Change

I am developing 2d game with landscape and portrait orientation support. I write following code for this purpose.

 public class DeviceOrientationController : MonoBehaviour
 {
     private bool isLandscape;
 
     public GameObject cameraLandscape, cameraPortrait;
     public GameObject landscapeView, portraitView;
 
     void Awake ()
     {
         if (Input.deviceOrientation == DeviceOrientation.LandscapeLeft || Input.deviceOrientation == DeviceOrientation.LandscapeRight && isLandscape) 
             isLandscape = true;
         else
             isLandscape = false;
         SetOrientaiton ();
     }
     
     void Update ()
     {
         SetOrientaiton ();
     }
 
     private void SetOrientaiton ()
     {
         if (Input.deviceOrientation == DeviceOrientation.LandscapeLeft || Input.deviceOrientation == DeviceOrientation.LandscapeRight && isLandscape) { 
             ActiveLandscapeView (true);
             ActivePortraitView (false);
             GameManager.Instance.IsActiveLandscape = true;
             isLandscape = false;
         } else if (Input.deviceOrientation == DeviceOrientation.Portrait || Input.deviceOrientation == DeviceOrientation.PortraitUpsideDown && !isLandscape) {
             ActivePortraitView (true);
             ActiveLandscapeView (false);
             GameManager.Instance.IsActiveLandscape = false;
             isLandscape = true;
         }
     }
 
     private void ActivePortraitView (bool value)
     {
         cameraPortrait.SetActive (value);
         portraitView.SetActive (value);
     }
 
     private void ActiveLandscapeView (bool value)
     {
         cameraLandscape.SetActive (value);
         landscapeView.SetActive (value);
     }
 }

On device orientation change, I active/de active respective camera. But each time I have to shake my device to view actual layout.

How to come out from this? If you want any more detail then I am ready to provide any time.