Unity fails to load some chunks in my game

so i have this problem that each time i respawn my surrondings fail to load and almost every chunk are invisible please help and after now after i closed unity and re-opened it, i have the same problem this is the code i used (c#):

using UnityEngine; using System.Collections; public class DeathTrigger : MonoBehaviour { // Use this for initialization void Start() {

}

// Update is called once per frame void Update() {

}

void OnTriggerEnter2D(Collider2D other) { if (other.gameObject.CompareTag("Player")) Application.LoadLevel(Application.loadedLevel); } }