Electron - Mqtt problem with reconnect

Troubleshooting
1

Im having a issue with MQTT. Im currently using a third-party sim, and manual mode (rarely connect to particles cloud). Basically this is my loop

if (Cellular.ready()) 
{
  digitalWrite(ledGPRS,0);
  attempts = 0;
  if (mqttClient.isConnected()) {
      mqttClient.loop();
  } else {
     Serial.println("Connect to the MQTT server!!");
     mqttClient.connect(clientId,username,password);
 if (mqttClient.isConnected()) {
      Serial.println("Connected");
      mqttClient.addQosCallback(qoscallback);
      mqttClient.publish("reconnections", celu.imei);
  }
}
}
else
{
   digitalWrite(ledGPRS,1);
   if(attempts > 10){ 
      System.reset();
}

if ((millis() - lastConnect) >= CONNECT_TIMEOUT)
{
    if(bomba_encendida == APAGADO) // Si la bomab esta desconectada
    {
        Cellular.disconnect();
        Cellular.off();
        delay(5000);
        debug < 1 ? debug=0:Serial.println("Intento conectar modem celular.");
        Cellular.on();
        Cellular.connect();
        lastConnect = millis();
        attempts++;
    }
}
}

Sometimes it connects, but if reset it, when trying again , won’t connect again
I was able to get the log from CloudMqtt, and basically the connection request is done, however i think de conACK never arrives, so the connection is never established. Any idea? Thanks

1502718718: New connection from 179.29.45.169 on port 18509.
1502718726: New connection from 179.29.45.169 on port 18509.
1502718734: New connection from 179.29.45.169 on port 18509.
1502718747: New connection from 179.29.45.169 on port 18509.
1502718754: New connection from 179.29.45.169 on port 18509.
1502718762: New connection from 179.29.45.169 on port 18509.
1502718770: New connection from 179.29.45.169 on port 18509.
1502718778: New connection from 179.29.45.169 on port 18509.
1502718786: New connection from 179.29.45.169 on port 18509.
1502718793: New connection from 179.29.45.169 on port 18509.
1502718801: New connection from 179.29.45.169 on port 18509.
1502718809: New connection from 179.29.45.169 on port 18509.
1502718817: New connection from 179.29.45.169 on port 18509.
1502718825: New connection from 179.29.45.169 on port 18509.
1502718858: New connection from 179.29.45.169 on port 18509.
1502718991: New connection from 179.29.45.169 on port 18509.
1502719150: New connection from 179.29.45.169 on port 18509.
2

As answered in the PM, I guess tearing down the client, when a WiFi connection loss is detected, might help.