GATT connection timeout?

Hi!
I am playing with GATT with Puck.js being a central device :

var serviceUUID="2fc3af42-7a4a-1431-d1f1-fs5­51e3bf022";
var characteristicUUID="32160fb9-5337-4e71-b­0f8-ff412e3ae078";
var MessageToSend=[0x00,0x01,0x03];

NRF.requestDevice({ filters: [{ name: Devname }] }).then(function(device) {
      return device.gatt.connect();
    }).then(function(g) {
      gatt = g;
      console.log(gatt);
      console.log(gatt);
      console.log(gatt);
      console.log(gatt);
      return gatt.getPrimaryService(serviceUUID);
    }).then(function(service) {
      return service.getCharacteristic(characteristic­UUID);
    }).then(function(characteristic) {
      return characteristic.writeValue(MessageToSend)­;
    }).then(function() {
      gatt.disconnect();
      console.log("Done!");
    });

and in the console I get :

=undefined
BluetoothRemoteGATTServer {
  "device": BluetoothDevice {
    "id": "96:05:05:f7:ac:1c random",
    "rssi": -57,
    "data": new Uint8Array([2, 1, 26, 10, 255, 76, 0, 16, 5, 1, 16, 139, 101, 67]).buffer,
    "name": "AABBCCDD",
    "gatt":  ...
   },
  "connected": true }
BluetoothRemoteGATTServer {
  "device": BluetoothDevice {
    "id": "96:05:05:f7:ac:1c random",
    "rssi": -57,
    "data": new Uint8Array([2, 1, 26, 10, 255, 76, 0, 16, 5, 1, 16, 139, 101, 67]).buffer,
    "name": "AABBCCDD",
    "gatt":  ...
   },
  "connected": true }
BluetoothRemoteGATTServer {
  "device": BluetoothDevice {
    "id": "96:05:05:f7:ac:1c random",
    "rssi": -57,
    "data": new Uint8Array([2, 1, 26, 10, 255, 76, 0, 16, 5, 1, 16, 139, 101, 67]).buffer,
    "name": "AABBCCDD",
    "gatt":  ...
   },
  "connected": false }
BluetoothRemoteGATTServer {
  "device": BluetoothDevice {
    "id": "96:05:05:f7:ac:1c random",
    "rssi": -57,
    "data": new Uint8Array([2, 1, 26, 10, 255, 76, 0, 16, 5, 1, 16, 139, 101, 67]).buffer,
    "name": "AABBCCDD",
    "gatt":  ...
   },
  "connected": false }
Uncaught Error: Unhandled promise rejection: Not connected
> 

having a look at the BluetoothRemoteGATTServer .connected state, is shows true, true,false,false. Why such a behaviour? is there really a timeout anywhere?