why does is monitorNet() being called as many times as i navigate to another view controller?

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  As I said in title, I can't navigate into LoginViewController. I show you my code:

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  [...]
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  [...]
  

  In my LoginViewController I have only text "FALSE". In MainViewController I have text "TRUE" When I try navigate to MainViewController (with arrow), it works, but when I try navigate to LoginViewController, I have output in console : ViewController not found

  The storyboard:

  

  StoryboardsID are fine, because I don't have any exceptions:

  MainViewController

  

  LoginViewController

  

  How to solve it and navigate to LoginViewController?
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