Coroutine called constantly

Unity Engine
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1 
public IEnumerator StartCountdown()
    {
        if (countdownActive)
            yield break; // Don't start a new countdown if one is already active

        countdownActive = true;
        GameManager.Instance.countdownPage.SetActive(true);
        startCountdownInt = 3;
        UserInputs.inputREF.enabled = false;
        status.text = "Get Ready";

        while (startCountdownInt >= 0)
        {
            Debug.Log(startCountdownInt);
            countdown.text = startCountdownInt.ToString();

            yield return new WaitForSeconds(.3f);

            startCountdownInt--;
        }

        timerActive = true;
        UserInputs.inputREF.enabled = true;
        GameManager.Instance.countdownPage.SetActive(false);
        GameManager.Instance.gameUI.SetActive(true);
        countdownActive = false; // Reset the flag when countdown is done

        Debug.Log("Finished");
    }


public class ResetPosition : MonoBehaviour
{
    public Transform spawnPos;

    // Update is called once per frame
    void Update()
    {
        if (transform.position.y < -50f)
        {
            ResetPos();
        }

        if (UserInputs.inputREF.resetInput)
        {
            Debug.Log("RESETING");
            ResetPos();

            StartCoroutine(GameManager.Instance.timing.StartCountdown());
        }
    }

    public void ResetPos()
    {
        Rigidbody rb = GetComponent<Rigidbody>();
        rb.velocity = Vector3.zero;
        rb.angularVelocity = Vector3.zero; // Also reset angular velocity

        // Temporarily disable physics
        rb.isKinematic = true;

        // Stop swinging logic
        if (GetComponent<Swinging>().isActiveAndEnabled)
        {
            GetComponent<Swinging>().StopSwinging();
        }
       

        // Reset position using Rigidbody
        rb.position = spawnPos.position;

        // Reset rotation
        rb.rotation = spawnPos.rotation;

        // Reset camera rotation
        GetComponent<PlayerMovement>().playerCamTransform.gameObject.transform.rotation = spawnPos.rotation;

        // Re-enable physics
        rb.isKinematic = false;

        // Restart the timer
        GameManager.Instance.RestartTimer();
       
    }
}

In this script I am trying to call a coroutine to run a countdown when the player presses the reset button, this works fine when called by falling to far (First if statement) or at the start of a level but when the player presses a reset it gets stuck in a loop

This is the code for my input manager

void SetUpInputActions()
    {
        actions.Player.Enable();
        actions.UI.Enable();

        moveAction = actions.Player.WASD;
        lookAction = actions.Player.Look;
        jumpAction = actions.Player.Jump;
        sprintAction = actions.Player.Sprint;
        crouchAction = actions.Player.Crouch;
        swingAction = actions.Player.Swing;
        resetAction = actions.Player.Reset;
        pauseAction = actions.Player.Pause;

        UINextTab = actions.UI.NextTab;
        UIPrevTab = actions.UI.PrevTab;
    }

    void UpdateInputs()
    {

        moveInput = moveAction.ReadValue<Vector2>();
        lookInput = lookAction.ReadValue<Vector2>();
        jumpFloat = jumpAction.ReadValue<float>();
        crouchFloat = crouchAction.ReadValue<float>();
        jumpInput = jumpAction.WasPressedThisFrame();
        sprintInput = sprintAction.WasPressedThisFrame();
        crouchInput = crouchAction.WasPressedThisFrame();
        notCrouchInput = crouchAction.WasReleasedThisFrame();
        swingInput = swingAction.WasPressedThisFrame();
        notSwingInput = swingAction.WasReleasedThisFrame();
        resetInput = resetAction.WasPressedThisFrame();
        pauseInput = pauseAction.WasPressedThisFrame();

        nextTabInput = UINextTab.WasPressedThisFrame();
        prevTabInput = UIPrevTab.WasPressedThisFrame();
    }
}

When the coroutine isn’t in there it only fires once. Any help appreciated