RAK8212 - Cannot connect to network after some time

I've just turned on the modem, and sent AT, but sometimes it fails because of those messages.

Shouldn't it be sent only on turning modem up?

var gprs;
Bluetooth.setConsole(true);
var at;
console.log("Turning Cell on");
require("iTracker").setCellOn(true, function(usart) {
  console.log("Waiting 30 sec for GPRS connection");
  at = require('AT').connect(usart);
  at.debug();
});
>
Turning Cell on
Waiting 30 sec for GPRS connection
] "\r"
] "\nRDY\r\n"
] "\r\n+"
] "PACSP1\r\n"
] "\r\nR"
] "DY\r\n"
] "\r\n+"
] "PACSP1\r\n"
] "AT\r"
] "\r\nOK\r\n"
>at.cmd("AT\r\n")
["AT\r\n"
=undefined
] "\r\nR"
] "DY\r\n"
] "\r\n+"
] "PACSP1\r\n"
] "\r\nR"
] "DY\r\n"
] "\r\n+"
] "PACSP1\r\n"

I can't connect to the network anymore.

It only happens when the SIM card is present.
What do i do?