Enemy circles player instead of attacking.

``When you have set the distance you have to be before attacking you can do something along the lines of this:

 var speed : float = 3;
 var diffVector: Vector3 = target - transform.position;
 
      var movement : Vector3;
     
         if(diffVector.magnitude > 1){
          movement = (diffVector.normalized * speed);
         }

This will prevent the enemy from slowing down when it gets closer to the target.

However in my own experience of enemyAI it's better to add a collider that is trigger then if the player is in that area you can start the animation playing etc.