Azure relay hybrid connection listener not reestablishing when internet is disrupted

Question

I have CUSTOM azure hybrid connection listener service running on premise with below mention code as MSDN suggested, but listener not getting reestablished when on premise INTERNET connectivity get disrupted.

Only 1 out of 10 times, listener getting reestablished with below code, when on premise INTERNET is disrupted

// Opening the listener establishes the control channel to  
// the Azure Relay service. The control channel is continuously   
// maintained, and is reestablished when connectivity is disrupted       
  await listener.OpenAsync(cts.Token);

//Below delegate not getting called when INTERNET plugged off from 
//listener running machine
  listener.Offline += listener_Offline;

What changes required to reestablish listener to azure hybrid connection 10 out of 10 times?. Please advice.