Player's action / frame Update

Hi,

I have created 2 scenes and I want the player to go from one scene to another by pressing a keyboard touch (E) when he is in a specific triggerable areas.

Basically, my script is :

 private GameObject FindPlayer()
 {
     GameObject[] _player;
     _player = GameObject.FindGameObjectsWithTag("Player");
     return _player[0];
 }

 void Awake()
 {
     Application.targetFrameRate = 300;
     _player = FindPlayer();
 }

 public void OnTriggerEnter(Collider col)
 {    
     if (col.tag == "Player")
     {
         CollisionWithPlayer = true;
     }
 }

 public void OnTriggerExit(Collider col)
 {
     if (col.tag == "Player")
     {
         CollisionWithPlayer = false;
     }
 }

IEnumerator LoadYourAsyncScene() {

     Scene currentScene = SceneManager.GetActiveScene();
     AsyncOperation asyncLoad = SceneManager.LoadSceneAsync(_SceneToLoad, LoadSceneMode.Additive);

     while (!asyncLoad.isDone)
     {
         yield return null;
     }

     SceneManager.MoveGameObjectToScene(_player, SceneManager.GetSceneByName(_SceneToLoad));
     SceneManager.UnloadSceneAsync(currentScene);

 }


 public void FixedUpdate()
 {
     if (Input.GetKeyDown(KeyCode.E) & CollisionWithPlayer == true)
     {
         StartCoroutine(LoadYourAsyncScene());
     }
 }

The script seems to work nice for the loading/unloading of the scene, however, when i press E in the zone, quite often (3/10), nothing happens. I thought it was because I orginally used the OnTriggerStay function whch doesn't update every frame. So I swapped on FixedUpdate function but I still got the bug :(

I had the same trouble without the part where I load/unload scene :(

Btw, the others keyboard touches (P, W...) have the same problem in game but I can write properly with my keyboard.

Do you know what is wrong with the script?