Why score cannot add when OnCollisionEnter more than three?

Unity Engine
1

When my gameobject GameBox touch another gameobject GameBox for first two time,
it will add score, but if more than 2 times touch,
it cannot add score,
why this happen?
am i write something wrong?

void OnCollisionEnter(Collision col)
    {
        if (col.gameObject.tag == "GameBox")
        {
            col.transform.rigidbody.constraints = RigidbodyConstraints.FreezeAll;
            AddScore();
        }
    }
2

Try a print or Debug.Log to see if the problem is with OnCollisionEnter or your AddScore() function.

3

I had try,
not score add for the debug log.
How can it be?