Smooth Camera help

I am trying to get a camera to follow my 2D character smoothly and am having issues. It seems that the camera appears to work for a while and then when it goes too far to the left or right it just keeps moving until I am off screen. Here is my code if anyone wants to help me. I dont know what I am doing wrong. to me my code says if the camera is 50 units to the left or right of the character move towards the character, but perhaps i am missing something. PLEASE someone help me. ps: mrLock is my character i am calling upon.

 var mrLock;
 var cameraSpeed;
 var distanceFromCharacterX;
 
 function Awake()
 {
     cameraSpeed = .25;
     distanceFromCharacterX = 50;
     mrLock = (GameObject.FindGameObjectWithTag("DeadLock")).GetComponent(deadLock);
 }
 
 function Update ()
 {
     if(mrLock.transform.position.x - transform.position.x >= distanceFromCharacterX)
         {
             transform.position.x +=  mrLock.transform.position.x * Time.deltaTime * cameraSpeed;
         }
     else if(mrLock.transform.position.x - transform.position.x <= -distanceFromCharacterX)
         {
             transform.position.x +=  mrLock.transform.position.x * Time.deltaTime * cameraSpeed;
         }
 }