OnTriggerStay weird behaviour

Can somebody pleas take a look at this script ?`using UnityEngine; using System.Collections;

I'm trying to use it - it works, but i get the prints (e.g. ("Something went wrong. Where is the player?");) like three times per F key released. What did i do wrong ? Thanks in advance guys.

 using UnityEngine;
 using System.Collections;
 
 public class EnterExit : MonoBehaviour {
     
     
     public Drivetrain Drivetrain;
     public CarController CarController;
     public SoundController SoundController;
     public  GameObject Car;
     public  GameObject ExitPoint;
     public  GameObject CarCamera;
     public  GameObject Player ;
     public  GameObject PlayerCamera;
 
     public string PlayerState;
     bool IsPlayerInCar;
     bool IsPlayerInTrigger;
     // Use this for initialization
 void Start () {
     CarController  = GetComponent (typeof (CarController)) as CarController;
     SoundController  = GetComponent (typeof (SoundController)) as SoundController;
     IsPlayerInTrigger = false;
     IsPlayerInCar = false;
     }
 
     
 void OnTriggerStay(Collider Player) {
         if(Player.tag=="Player") {
     IsPlayerInTrigger = true;
         }
     }
 void OnTriggerExit(Collider Player) {
     
         if(Player.tag=="Player") {
     IsPlayerInTrigger = false;
         }
     }
 
 void LateUpdate () {
 
     if (Input.GetKeyUp(KeyCode.F)) {
         if (!IsPlayerInCar && !IsPlayerInTrigger) {
             print ("Something went wrong. Where is the player?");
 
             }
             
         if (!IsPlayerInCar && IsPlayerInTrigger) {
             EnterCar();
             }
             
         if (IsPlayerInCar && !IsPlayerInTrigger) {
             ExitCar();
         }
         if (IsPlayerInCar && IsPlayerInTrigger) {
             print ("Something went wrong(Maybe ExitPoint not set right)");
         }
             
     }
         if (IsPlayerInCar) {
             PlayerState = "In Car";
         }
         if (!IsPlayerInCar) {
             PlayerState = "Not in Car";
         }
         if (IsPlayerInTrigger) {
             PlayerState = "In Trigger";
             }
             
         if (!IsPlayerInTrigger) {
             PlayerState = "Out of Trigger";
             }
     }
 
                 
  void EnterCar () {
 
                 PlayerCamera.camera.enabled = false;
                 PlayerCamera.gameObject.GetComponent<AudioListener> ().enabled = false;
                 Player.gameObject.transform.parent = ExitPoint.transform;
                 Player.transform.localPosition = new Vector3(0,20,0);
                 Player.transform.localRotation = new Quaternion(0,0,0,0);
 //                Player.gameObject.SetActive(false);
                  Player.gameObject.GetComponent<CharacterMotor>().enabled = false;
                 CarController.enabled = true;
                 Drivetrain.enabled = true;
                    CarCamera.gameObject.GetComponent<Camera> ().enabled = true;
                    CarCamera.gameObject.GetComponent<AudioListener> ().enabled = true;
                    CarCamera.gameObject.GetComponent<MouseOrbit> ().enabled = true;
                 IsPlayerInCar = true;
                 SoundController.EngineOn = true;
 }
     
             
  void ExitCar () {
              
                 CarController.brake = 999;
                 CarController.enabled = false;
                 Drivetrain.enabled = false;
                 CarCamera.camera.enabled = false;
                    CarCamera.gameObject.GetComponent<Camera> ().enabled = false;
                    CarCamera.gameObject.GetComponent<AudioListener> ().enabled = false;
                    CarCamera.gameObject.GetComponent<MouseOrbit> ().enabled = false;
                 PlayerCamera.gameObject.GetComponent<AudioListener> ().enabled = true;
                 PlayerCamera.gameObject.GetComponent<Camera> ().enabled = true;
                 Player.transform.localPosition = new Vector3(0,0,0);
                 Player.gameObject.transform.parent = null;
                 Player.transform.localRotation = new Quaternion(0,0,0,0);
 //                Player.gameObject.SetActive(true);
                  Player.gameObject.GetComponent<CharacterMotor>().enabled = true;
                 IsPlayerInCar = false;
                 SoundController.EngineOn = false;
 
 }         
     
 }
         
     
 
 //void OnGUI ()
 //    {
 //        
 //        GUI.color = Color.black;
 //        GUI.Label (new Rect (5, 220, 1024, 300), "Current Player State =  " + PlayerState);
 //    }
 //}