Unintentional Occasional Collision

I'm working on a game where you try not to run into obstacles. I have main issue with it however, and that is that some instantiated clones that the player collides with don't activate OnCollisionEnter() on either script. (I have a different script with OnCollisionEnter() on the player and the obstacle, and neither are activated.) Why is it doing this? Again I don't think it's an issue with a single piece of code, seeing as I have two separate scripts with OnCollisionEnter(), and neither of them are being called.

Thanks a Million!

Player Code: public class Player : MonoBehaviour { public GameObject button;

     public Rigidbody rb;
 
     public MeshRenderer render;
 
     public GameObject particles;
 
     public Material material;
 
     float jumpSpeed = 15;
     float moreGravity = 13;
     float gravityMultiplier = 6;
     float jumpLength = 0;
     float torque=1000;
 
     public bool jump = false;
     public bool gamePlaying = true;
     bool madeFaster = false;
     bool touchingGround = true;
 
     private void Start()
     {
         material.color = Random.ColorHSV();
         render.enabled = true;
         Physics.gravity = new Vector3(0, -9.81f * gravityMultiplier, 0);
     }
     void Update ()
     {
         if (gamePlaying == true)
         {
             if (touchingGround == true)
             {
                 if (jumpLength <= 8)
                 {
                     if ((Input.anyKey && button.GetComponent<Button>().touchingButton == false)  || jump)
                     {
                         if (jumpLength == 0)
                             rb.AddTorque(-1*torque,0f, 0f);
                         rb.velocity = new Vector3(0,1,0)* jumpSpeed;
                         jumpLength++;
                     }
                     else if (jumpLength > 0)
                         touchingGround = false;
                 }
                 else
                 touchingGround = false;
 
             }
             if (touchingGround == false)
             {
                 if (rb.velocity.y < -0.1 && madeFaster == false)
                 {
                     Physics.gravity = new Vector3(0, moreGravity * -1 * gravityMultiplier, 0);
                     madeFaster = true;
                 }
             }
         }
 
     }
 
     private void OnCollisionEnter(Collision collision)
     {
         touchingGround = true;
         if (collision.gameObject.tag == "Fence" || collision.gameObject.tag == "Rock" || collision.gameObject.tag == "Stump")
         {
             gamePlaying = false;
             Colapse();
         }
         if (collision.gameObject.name == "Ground")
         {
             jumpLength = 0;
             Physics.gravity = new Vector3(0, -9.81f * gravityMultiplier, 0);
             madeFaster = false;
             rb.rotation = Quaternion.identity;
         }
 
     }
     void Colapse()
     {
         render.enabled = false;
         Quaternion rotation = new Quaternion();
         rotation.x = 0;
         rotation.y = 0;
         rotation.z = 0;
         Destroy(Instantiate(particles, rb.position, rotation), 2);
     }
 }

Cloned Obstacle Code: public class ObsticleClone : MonoBehaviour {

     public GameObject obsticle;
     public GameObject particles;
     
     public bool changedScore = false;
 
     float time;
     public float speed;
 
     private void Start()
     {
          particles = obsticle.GetComponent<Obsticle>().particles;
         speed = obsticle.GetComponent<Obsticle>().speed;
     }
 
     void Update ()
     {
         if (name == "Obsticle")
         {
             time = obsticle.GetComponent<Obsticle>().time;
             this.gameObject.transform.position = new Vector3(gameObject.transform.position.x, gameObject.transform.position.y, gameObject.transform.position.z + speed + (time / 200f));
             if (gameObject.transform.position.z >= 14.17f)
             {
                 obsticle.GetComponent<Obsticle>().clone = true;
                 Destroy(this.gameObject);
             }
             if (gameObject.transform.position.z >= 8.78f && !changedScore)
             {
                 changedScore = true;
                 obsticle.GetComponent<Obsticle>().score++;
             }
         }
     }
 
     private void OnCollisionEnter(Collision collision)
     {
         if (collision.gameObject.name == "Player")
             Colapse();
     }
 
     void Colapse()
     {
         Renderer r = this.GetComponent<Renderer>();
         Collider c = this.GetComponent<Collider>();
         c.enabled = false;
         r.enabled = false;
         Destroy(Instantiate(particles, this.gameObject.transform.position, this.gameObject.transform.rotation), 2);
         Destroy(this.gameObject);
     }
 }
 

Again, thank you so much!