Camera following Rigidbody jitter every few seconds with background

Camera following Rigidbody2D jitter every few seconds with background (non rigidbody) objects (Obstacles). The FPS in profiler is fine it is near to 100. also Interpolate is also fine. Using Unity 2017.4.12 (LTS) Camera Follow Script

  public class CameraFollow : MonoBehaviour {
         public float followRange = 0.5f;
         public float cameraZ;
         public Transform Player;
         public Vector3 newPos;
         void Start () {
             cameraZ = transform.position.z;
         }
         void FixedUpdate() {
             newPos = new Vector3(Player.position.x + followRange, 0, cameraZ);
             transform.position = Vector3.Lerp(transform.position, newPos, 0.5f);
         }    
     }
 

Player Script :

 public class PlayerBall : MonoBehaviour {
 
     public float xSpeed = 10;
 
     // Update is called once per frame
     void FixedUpdate () {
         this.transform.position = new Vector3(this.transform.position.x + Time.fixedDeltaTime * xSpeed, 
             this.transform.position.y , transform.position.z);
     }
 
 }

Project File Download