Go why (it closes by itself) ampq channel closes?

Question

go

1) There is a queue with one message (for the test)
2) Again, for the test, the message is always returned to the queue Code example
msg.Nack(false, true)

func addSmsSender(ampq <-chan amqp.Delivery, status *string) {
  var me MyStruct
  for true {
    if *status != "Connected" {
      fmt.Printf("Alarm connect\r\n")
      fmt.Print(*status)
      time.Sleep(Constants.VirginTimeout * time.Millisecond)
      continue
    }

    msg, ok := <-ampq
    //если канал закрыт, то ложимся спать
    if !ok {
      fmt.Print("Я сплю\r\n")
      json.Unmarshal([]byte(msg.Body), &me)
      fmt.Printf("%+v\n",&me)
      time.Sleep(Constants.VirginTimeout * time.Millisecond)
      continue
    }
    fmt.Print("Read\r\n")

    err := json.Unmarshal([]byte(msg.Body), &me )
    if err != nil {
      //здесь обработка ошибок распаковки джсона
      fmt.Printf("JSON UNMARSHAL ERR")
      //ок говорим что ошибка в JSON и выкидываем обратно в очередь, мб повезет в след раз заработает
      msg.Nack(false, true)
      continue
    }
.......
           msg.Nack(false, true)

In fact, this is the most buggy code in my life. I note that after the second iteration, the message is not taken from the queue, it just lies there.
result of
Read
Read
I sleep
&{IDTurn:1021727027 IDUser:7410 IDPackageUser:29364}
I sleep
&{IDTurn:1021727027 IDUser:7410 IDPackageUser
:
29364
} UNMARSHAL ERR
If I change for true { .... } to for msg := range ampq { .... }, then the output changes to
Alarm connect
Alarm connect
....
Why does the channel itself close?
additional question, why in the last case I can't read the value by reference?
At the same time, when creating a worker, I add a listener to close the channel.

go func() {
    fmt.Printf("closing: %s", <-w.conn.NotifyClose(make(chan *amqp.Error)))
  }()

But it's not in the output. those. it turns out the channel is closed, but judging by the log it is still open.