Constantly Targeting with an InvokeRepeating and Random Targeting

Hi, I have a script which in theory is fine, but there are lots of things that don't work to plan (not syntax errors, the script is fine). It is in C#. The main issue is that I want my object to target the target and follow it for 5 seconds until it resets, but it constantly follows the player, does anybody have any ideas why it would do this and how to stop it? The 2nd issue is that tr_player (the transform variable) always sets itself to my 5th target, so if anyone has any ideas about that it would be very helpful. This is my script:

     public Transform Bird;
 public Transform tr_Player;
 public float f_MoveSpeed = 25.0f, f_RotSpeed = 1000.0f;
 
 void Start () {

     tr_Player = GameObject.FindGameObjectWithTag ("Target").transform;

     InvokeRepeating("Reset",5, 5);

 }

 void Update () {

     transform.position += transform.forward * f_MoveSpeed * Time.deltaTime;
 
 }

 void Reset()
 {
     transform.position = Bird.position;

     tr_Player = GameObject.FindGameObjectWithTag ("Target").transform;

     transform.LookAt(tr_Player);

 }

}

Probably just a noob error but if anyone could help me with those two errors it would be really helpful!