Issue where Fading out Game Object causes screen to blank and then reload with gameobject gone

The objective is to have a "smoke" to fade away to nothing after 2 seconds of being instantiated. When it is instantiated, the game (in VR) blanks out to the blank white grid screen and then the screen reloads after two seconds with the smoke gameobject gone.

No clue as to why this is happening. Is this function too resource intensive?

 using UnityEngine;
 using System.Collections;
 
 public class TimeForSmoke : MonoBehaviour {
 
     public Renderer[] smokeFades;
     private float timeLeft=2.0f;
 
 
     // Update is called once per frame
     void Start()
     {
         smokeFades = GetComponentsInChildren<Renderer>();
     }
     void Update ()
     {
         StartCoroutine(FadeOut());
         timeLeft -= Time.deltaTime;
         if (timeLeft < 0)
         {
             Destroy(this.gameObject, 0f); //removes instantiated smoke
 
         }
     }
     IEnumerator FadeOut()
     {
         for (float f = timeLeft; f >= 0; f -= 0.1f)
         {
             Debug.Log("1");
             foreach (Renderer smokeFade in smokeFades)
             {
                 Debug.Log("2");
                 Color opacity = smokeFade.material.color;
                 opacity.a = f;
                 smokeFade.material.color = opacity;
             }
             Debug.Log("3");
             yield return new WaitForSeconds(.1f);
         }
         
     }
 }