Unity Android game doesn't respond to touches

Hello. I have an Android game where user moves player by touching left and right side of the screen. I tried the game on Android and all worked OK. But one day it stopped working: buttons work but I can't control the Player by touching screen sides. I tried to reinstall Unity, delete Library folder and even tried other OS. It didn't help. How can I fix my project?

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class MovingPlayer : MonoBehaviour
 {
 
     public float playerSpeed;
     public float maxPos = 2.7f;
 
     Vector3 position;
     public uiManager ui;
     public AudioManager am;
 
     public Text coinCount;
 
     int coin;
 
     bool currntPlatformAndroid = false;
 
     Rigidbody2D rb;
 
     public GameObject particleSystemPrefab;
 
     void Awake()
     {
         rb = GetComponent<Rigidbody2D>();
 
 #if UNITY_ANDROID
         currntPlatformAndroid = true;
 #else
                 currentPlatformAndroid = false;
 #endif
 
         am.playerSound.Play();
 
     }
 
     // Use this for initialization
     void Start()
     {
         coin = 0;
         position = transform.position;
     }
 
 
     // Update is called once per frame
     void Update()
     {
 
         if (currntPlatformAndroid == true)
         {
             TouchMove();
             //AccelerometerMove();
         }
 
         else
         {
 
             position.x += Input.GetAxis("Horizontal") * playerSpeed * Time.deltaTime;
 
             position.x = Mathf.Clamp(position.x, -2.7f, 2.7f);
 
             transform.position = position;
         }
 
         position = transform.position;
         position.x = Mathf.Clamp(position.x, -2.7f, 2.7f);
 
         transform.position = position;
 
     }
 
     void OnCollisionEnter2D(Collision2D col)
     {
         if (col.gameObject.tag == "CubeObstacle")
         {
             //Destroy (gameObject);
             foreach (ContactPoint2D contact in col.contacts)
             {
                 Instantiate(particleSystemPrefab, contact.point, Quaternion.identity);
 
             }
             //gameObject.SetActive(false);
 
             GameOverActivated();
             ui.gameOverActivated();
             am.playerSound.Stop();
         }
 
         if (col.gameObject.tag == "Coin")
         {
             Destroy(col.gameObject);
             coin += 1;
             coinCount.text = coin.ToString();
 
             Debug.Log("Coin");
         }
 
     }
 
     public void GameOverActivated()
     {
         Time.timeScale = 0;
         PlayerPrefs.SetInt("coins", PlayerPrefs.GetInt("coins") + coin);
     }
 
 
     void AccelerometerMove()
     {
         float x = Input.acceleration.x;
 
         if (x < -0.1f)
         {
             MoveLeft();
         }
 
         else if (x > 0.1f)
         {
             MoveRight();
         }
 
         else
         {
             SetVelocityZero();
         }
     }
 
     void TouchMove()
     {
         if (Input.touchCount > 0)
         {
             Touch touch = Input.GetTouch(0);
             float middle = Screen.width / 2;
 
             if (touch.position.x < middle && touch.phase == TouchPhase.Began)
             {
                 MoveLeft();
             }
 
             else if (touch.position.x > middle && touch.phase == TouchPhase.Began)
             {
                 MoveRight();
             }
         }
         else
         {
             SetVelocityZero();
         }
     }
 
     public void MoveLeft()
     {
         rb.velocity = new Vector2(-playerSpeed, 0);
     }
 
     public void MoveRight()
     {
         rb.velocity = new Vector2(playerSpeed, 0);
     }
 
     public void SetVelocityZero()
     {
         rb.velocity = Vector2.zero;
     }
 }