Unresponsive Touch

Hello,

The title might be overstating it, but we are developing an action game and it requires fast and precise touches. However, sometimes, mainly during fps spikes (spikes = 25-30 fps, down from the regular 60 fps), the touch is... unresponsive, some of the touches are not interpreted.

My code for touch input detection is as follows:

 using UnityEngine;
 using System.Collections;
 
 public class TouchHandlerGame : MonoBehaviour
 {
     //public TextMesh debugText;
     
     private bool buttonClick;
     private Camera mainCamera;
     
     private bool mobile;
     
     //Variables for mouse slash
     private Vector3 initialSlashPos;
     private Vector2 initialTouchPos;
     private Vector2 initialClickCancelPos;
     
     private LayerMask layerNotHud;
     private LayerMask layerSlashable;
     
     private void Start()
     {
         layerNotHud = (1 << LayerMask.NameToLayer("BackgroundHUD")) | (1 << LayerMask.NameToLayer("ForegroundHUD")) | (1 << LayerMask.NameToLayer("FinisherHUD"));
         layerNotHud = ~layerNotHud;
         layerSlashable = (1 << LayerMask.NameToLayer("Slashable"));
         mainCamera = GameObject.Find("Main Camera").GetComponent<Camera>();
         if (Application.platform == RuntimePlatform.Android || Application.platform == RuntimePlatform.IPhonePlayer)
             mobile = true;
     }
     
     private void Update()
     {
         if (!GlobalValues.paused)
         {
             if (mobile)
             {
                 foreach (Touch touch in Input.touches)
                 {
                     if (touch.phase == TouchPhase.Began)
                     {
                         buttonClick = true;
                     }
                     if (touch.phase == TouchPhase.Moved)
                     {
                         //Cancela o Click se mover d+
                         if (initialClickCancelPos == Vector2.zero)
                             initialClickCancelPos = touch.position;
                         {
                             float sqrLen = (initialClickCancelPos - touch.position).sqrMagnitude;
                             if (sqrLen > 10000)
                             {
                                 initialClickCancelPos = Vector2.zero;
                                 buttonClick = false;
                             }
                         }    
                     
                     
                         Ray ray = mainCamera.ScreenPointToRay(touch.position);
                         RaycastHit hit = new RaycastHit();
                         if (Physics.Raycast(ray, out hit, Mathf.Infinity, layerSlashable))
                         {
                             if (initialTouchPos == Vector2.zero)
                                 initialTouchPos = touch.position;
                             {
                                 float sqrLen = (initialTouchPos - touch.position).sqrMagnitude;
                                 if (sqrLen > 200)
                                 {
                                     initialTouchPos = Vector2.zero;
                                     hit.collider.gameObject.SendMessage("OnMouseSlash", SendMessageOptions.DontRequireReceiver);
                                 }
                             }
                         }
                     }
                     if (touch.phase == TouchPhase.Ended)
                     {
                         if (buttonClick)
                         {
                             Ray ray = mainCamera.ScreenPointToRay(touch.position);
                             RaycastHit hit = new RaycastHit();
                             if (Physics.Raycast(ray, out hit, Mathf.Infinity, layerNotHud))
                             {
                                 if (hit.collider.tag != "Button")
                                     hit.collider.gameObject.SendMessage("OnMouseClickDown", SendMessageOptions.DontRequireReceiver);
                             }
                         }
                         buttonClick = false;
                         initialTouchPos = Vector2.zero;
                         initialClickCancelPos = Vector2.zero;
                     }
                 }
             }
             else
             {
                 if (Input.GetMouseButtonDown(0))
                 {
                     buttonClick = true;
                 }
                 if (Input.GetMouseButton(0))
                 {
                     //Cancela o Click se mover d+
                     if (initialSlashPos == Vector3.zero)
                         initialSlashPos = Input.mousePosition;
                     else
                     {
                         float sqrLen = (initialSlashPos - Input.mousePosition).sqrMagnitude; //Mais rapido que Vector3.Distance
                         if (sqrLen > 10000)
                         {
                             buttonClick = false;
                             initialSlashPos = Vector3.zero;
                         }
                     }
                     
                     Ray ray = mainCamera.ScreenPointToRay(Input.mousePosition);
                     RaycastHit hit = new RaycastHit();
                     if (Physics.Raycast(ray, out hit, Mathf.Infinity, layerSlashable))
                     {
                         if (initialSlashPos == Vector3.zero)
                             initialSlashPos = Input.mousePosition;
                         else
                         {
                             float sqrLen = (initialSlashPos - Input.mousePosition).sqrMagnitude; //Mais rapido que Vector3.Distance
                             if (sqrLen > 1000)
                             {
                                 buttonClick = false;
                                 initialSlashPos = Vector3.zero;
                                 hit.collider.SendMessage("OnMouseSlash", SendMessageOptions.DontRequireReceiver);
                             }
                         }
                     }
                 }
                 if (Input.GetMouseButtonUp(0))
                 {
                     if (buttonClick)
                     {
                         Ray ray = mainCamera.ScreenPointToRay(Input.mousePosition);
                         RaycastHit hit = new RaycastHit();
                         if (Physics.Raycast(ray, out hit, Mathf.Infinity, layerNotHud))
                         {
                             if (hit.collider.tag != "Button")
                                 hit.collider.SendMessage("OnMouseClickDown", SendMessageOptions.DontRequireReceiver);
                         }
                     }
                     buttonClick = false;
                     initialSlashPos = Vector3.zero;
                 }
             }
         }
     }
 }

The game is playable, it doesnt happen all that often, but more often than desired... am I detecting touches wrong? Does anyone else have this kind of problem?

Thank you for your attention, Best regards, Allan