Trigger doesn't work 100% of the time.

I am having such a hard time with this and I cant figure out why. I have two game objects: "player" and an enemy called "skeleSword". Both have rigid bodies and colliders. Player is using the FPS controller. "skelesword" has two child objects containing colliders: one on the weapon and one on the head. I scripted the weapon collider to destroy "player" on trigger enter. I scripted the Head collider to destroy "skelesword" on trigger enter. Then I made "skelesword" a prefab that spawns at random intervals. The problem I'm having is this: the body collider doesnt always detect a collision and the player falls through it.

Code:

Head Collider:

private GameObject skeleSword;

 void Start () {
     skeleSword = GameObject.FindWithTag("skeleSword");
 }
 
 void OnTriggerEnter(Collider other)
 {
     if (other.gameObject.tag == "Player") {
         Destroy (skeleSword);
         Debug.Log ("enter");
     }
 }

Weapon Collider:

 private GameObject hank;

 void Start () {

     hank = GameObject.FindWithTag("Player");
 }

 void OnTriggerEnter(Collider other){

     if (other.gameObject.tag == "Player" ) {
         Destroy (hank);
         Debug.Log ("enter");
     } 
 }

Here are some images from the project:

Weapon Collider is the exact same as the Head collider, but with the weapon collider script.