i'm trying to move the player horizontal and vertical in lanes but he keep shaking/vibrating

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class MovePlayer : MonoBehaviour {
 
 
     public static MovePlayer instance;
 
     [SerializeField] float speed;
     [SerializeField] float laneDistance;
     public int lane = 1;
     public int altd = 1;
 
     [SerializeField] CharacterController controller;
     
 
     void Awake()
     {
 
         if (instance == null) { instance = this; }
 
 
     }
 
 
     void Start()
     {
 
 
     }
 
 
     void Update()
     {
 
 
         Debug.Log("Lane " + lane);
         Debug.Log("vert " + altd);
 
 
 
         if (!GamePlayManager.instance.gameStarted || GamePlayManager.instance.gameOver)
         {
             return;
         }
 
         if (MobileInput.instance.SwipeLeft)
         {
             MoveLane(false);
 
         }
         if (MobileInput.instance.SwipeRight)
         {
             MoveLane(true);
         }
 
         if (MobileInput.instance.SwipeUp)
         {
             MoveAlt(true);
 
         }
         if (MobileInput.instance.SwipeDown)
         {
             MoveAlt(false);
         }
 
 
         Vector3 targetPos = transform.position.z * Vector3.forward;
 
         if (lane == 0)
         {
             targetPos += Vector3.left * laneDistance;
         }
         else if (lane == 2)
         {
             targetPos += Vector3.right * laneDistance;
         }
         if (altd == 0)
         {
             targetPos += Vector3.down * laneDistance;
         }
         else if (altd == 2)
         {
             targetPos += Vector3.up * laneDistance;
         }
 
         Vector3 moveVector = Vector3.zero;
         moveVector.x = (targetPos - transform.position).normalized.x * speed;
         moveVector.y = (targetPos - transform.position).normalized.y * speed;
         moveVector.z = speed;
 
         
         controller.Move(moveVector * Time.deltaTime);
 
     }
 
     void MoveLane(bool gRight)
     {
         lane += (gRight) ? 1 : -1;
         lane = Mathf.Clamp(lane, 0, 2);
     }
 
     void MoveAlt(bool gUp)
     {
         altd += (gUp) ? 1 : -1;
         altd = Mathf.Clamp(altd, 0, 2);
     }
 
     void OnControllerColliderHit(ControllerColliderHit hit)
     {
         if (hit.gameObject.tag == "Obstacle")
         {
             GamePlayManager.instance.gameOver = true;
             Debug.Log("GameOver");
         }
 
     }
 
 
 }
 

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