Camera rotate and move follow Player

I make a 2d game with characters moving around the earth. I wanted the camera to move and rotate the camera follow the character But move very jerky (if I increase the value of the parameter 3rd) and rotate the camera does not keep up the character (if I reduce the parameter value 3rd) Sorry my bad English Help me fix that

 void FixedUpdate ()
 {
     if (gc.gameState == GameController.GameState.playing || gc.gameState == GameController.GameState.changeWave) {
         transform.position = new Vector3 (player.transform.position.x, player.transform.position.y, transform.position.z);
         transform.rotation = Quaternion.Slerp (transform.rotation, 
                                                player.transform.rotation, 5 * Time.deltaTime);
     }
 }