3D Trigger collider slows player moved by forces

Hi, i have this monkey being moving by forces, but randomly he slown down (it looks like some kind of friction with the ground) , i noticed that this is caused by two trigger colliders (used to detect levers, chests and enemies ) because when i move these colliders position or i change any value of they , the monkey returns to its default speed, It happens Sometimes when i initialize the game, please help and excuse my english

these colliders have this ontrigger event asociated

First collider (detector)

     private void OnTriggerEnter(Collider other) 
         {
 
                     if(other.gameObject.tag=="enemy")
                         {       
                                 if(!lista.Contains(other.gameObject))
                                     {
                                         lista.Add(other.gameObject);
                                     }
                         }
 
         }

Second collider (mini detector)

     private void OnTriggerEnter(Collider other) 
         {       
                if(other.gameObject.tag=="palanca")
                 {
                         palanca= other.gameObject.GetComponent<Palanca>();
 
                 } 
                 if(other.gameObject.tag=="cofre")
                 {
                         cofre= other.gameObject.GetComponent<cofres>();
 
                 } 
         }
  
     void OnTriggerStay(Collider other)
     {
                        if(other.gameObject.tag=="palanca")
                          {
                         palanca= other.gameObject.GetComponent<Palanca>();
 
                          } 
                         if(other.gameObject.tag=="cofre")
                         {
                                 cofre= other.gameObject.GetComponent<cofres>();
 
                         }  
     }
     void OnTriggerExit(Collider other)
         {
             palanca=null;
             cofre=null;
                     
         }

The moving script has this code for each key (wasd)

 if(Input.GetKey("a"))) //rb =rigidBody
     {
           rb.AddForce(-transform.right*15,ForceMode.VelocityChange);        }