If cubes Collide controlls work if they dont collide they dont work

Hello i made an empty object that i set to the movement with my camera around the player so what i am trying to make is if(the cubes are colliding with this object){all staff here work only for the cubes that are collideing and if they go out of the collider they act normal } So i dont know why but when 1 cube collide with this object all began to do an activity that i set i want only the cubes that are in the collider to do something.Also the if's inside stop working ieven if they collide only E is working My code:

using UnityEngine; using System.Collections;

public class KeysInCollider : MonoBehaviour { public bool Gravitronned = false;

 // Use this for initialization
 void Start () {
 
 }
 
 // Update is called once per frame
 void Update ()
 {



     if (Gravitronned == true) {
         if (Input.GetKeyDown (KeyCode.C)) {
             Physics.gravity *= 0;

         }
         if (Input.GetKeyDown (KeyCode.X)) {
             Physics.gravity = new Vector3 (0, -3.0F, 0);


         }
         if (Input.GetKeyDown (KeyCode.V)) {
             Physics.gravity = new Vector3 (0, 3.0F, 0);


         }
         if (Input.GetKeyDown (KeyCode.Q)) {
         
             GetComponent<Rigidbody> ().velocity = Camera.main.ScreenToWorldPoint (Input.mousePosition) - transform.position;
         }
         if (Input.GetKeyUp (KeyCode.Q)) {

             Physics.gravity = new Vector3 (0, -6.0F, 0); 
         }
         if (Input.GetKeyDown (KeyCode.E)) {

             GetComponent<Rigidbody> ().velocity = Camera.main.ScreenToWorldPoint (Input.mousePosition) - transform.position;
         }
         if (Input.GetKeyUp (KeyCode.E)) {

             Physics.gravity *= 0;
         }
         if (Input.GetKeyDown (KeyCode.R)) {

             GetComponent<Rigidbody>().isKinematic = true;

         }
         if (Input.GetKeyUp (KeyCode.R)) {

             GetComponent<Rigidbody> ().isKinematic = false;
         }
     } 
     else 
     {
         Physics.gravity = new Vector3 (0, -6.0F, 0);
     }
 }
 void OnTriggerEnter (Collider col)
 {
     if (col.gameObject.name == "IfInScreenGrv") {
         Gravitronned = true;
     } else 
 {
     Gravitronned = false;
     }
 }

}