Photon's PUN 2 Error (719009)

I have a problem here with Photon’s PUN 2. Sometimes It works, but other times it doesn’t. Since the last 2 weeks it isn’t working that fine. Before it were better, I joined to the master, and then, to the lobby and It allowed me to list the rooms and join them without any problem. Now, I haven’t changed that code that much, I only changed it after the errors started. Now, sometimes it joins a match, but another it doesn’t, showing the following error:

JoinRandomRoom failed. Client is not on Master Server or not yet ready to call operations. Wait for callback: OnJoinedLobby or OnConnectedToMaster.

I only have 2 devices to test my online with PUN, but, even if I created a room is not working anymore, it just seems like works randomly. Here’s my code if you want to check it:

void Start()
{
   PhotonNetwork.ConnectUsingSettings();
}

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

}
public override void OnJoinedLobby()
{
   //   /* print("Connected to lobby")*/;

}
public override void OnConnectedToMaster()
{
   //This shows a popup to let know the player that is connected
   //PhotonNetwork.JoinLobby();
   base.OnJoinedLobby();
   GameObject.Find("IWifi").SetActive(false);
   print("Puga");
   StatePScript.IsShow = true;
   Connected = true;
   GameObject.Find("IOk").GetComponent<Image>().color = Color.white;
   print("IOKS Value is " + IOKS.Show);
   GameObject.Find("StatusText").GetComponent<Text>().text = "Connected!";
   GameObject.Find("StatusText").GetComponent<Text>().color = Color.green;
   A.Play();
   GameObject.Find("StatePanel").GetComponent<Animator>().SetBool("Show", false);
   IOKS.Show = false;
   GameObject.Find("IOk").GetComponent<Image>().color = new Color(0, 0, 0, 0);
   Connected = false;
   StatePScript.IsShow = false;
}

You’re more likely to get the attention of the people you need over in the Connect Games forum rather than in here.