camera shake (broken)

gistfile1.txt

using UnityEngine;
using System.Collections;

public class CameraShakes : MonoBehaviour {

	public Transform cameraTransform;
	public float shakeLength = 5;
	public float shakeTimer;
	public float shakeAmount = 3;
	public float shakeSpeed = 20;
	public bool isShaking = false;
	public bool shakeOnce = false;
	public Vector3 originalPos;

	Vector3 newPos;

	void Awake()
	{

		shakeTimer = shakeLength;
	}
	
	void OnEnable()
	{
		originalPos = cameraTransform.position;
	}
	
	void Update()
	{
		if (!isShaking) {
			shakeOnce = true;
			shakeTimer = shakeLength;
			newPos = cameraTransform.position;

		}
		
		if (shakeOnce) {
			Shake ();
			isShaking = false;
			shakeOnce = false;
		
		}
	}
	
	public void Shake() {
		if (shakeTimer > 0)
		{
			isShaking = true;
			
			if (Vector3.Distance(newPos,cameraTransform.position)<=shakeAmount/30) {newPos = originalPos+Random.insideUnitSphere * shakeAmount;}
			
			cameraTransform.position = Vector3.Lerp(cameraTransform.position, newPos , Time.deltaTime*shakeSpeed);
			
			shakeTimer -= Time.deltaTime;
		}
		else 
		{
			shakeTimer = 0f;
			cameraTransform.position = originalPos;
			isShaking = false;
			shakeOnce = false;
		}
	}
}