Node mcu esp8266 disconnects from MQTT broker - arduino

Question

I have two node mcu modules connected to the same network, running the same code and powered the same way. Both of them are subscribed to the topic Terma but one of them randomly disconnects and then reconnects to the MQTT broker meanwhile it stayed connected to the wifi uninterruptedly, the other module stays connected with no problem. I don't know if it is a network issue or if the node mcu is damaged.
here is the code:
#include <PubSubClient.h>
// Update these with values suitable for your network.
const char* ssid = "Milagros";
const char* password = "18095381";
const char* mqtt_server = "192.168.1.133";
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[50];
int value = 0;
void setup_wifi() {
delay(10);
// We start by connecting to a WiFi network
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
randomSeed(micros());
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void callback(char* topic, byte* payload, unsigned int length) {
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
for (int i = 0; i < length; i++) {
Serial.print((char)payload[i]);
}
Serial.println();
// Switch on the LED if an 1 was received as first character
if ((char)payload[0] == '1') {
digitalWrite(14, LOW);
client.publish("estado","1");
// but actually the LED is on; this is because
// it is active low on the ESP-01)
} else {
digitalWrite(14, HIGH);
client.publish("estado","0");
}
}
void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
// Create a random client ID
String clientId = "ESP8266Client-";
clientId += String(random(0xffff), HEX);
// Attempt to connect
if (client.connect(clientId.c_str())) {
Serial.println("connected");
// Once connected, publish an announcement...
client.publish("terma", "hello world 1");
// ... and resubscribe
client.subscribe("terma");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
void setup() {
pinMode(14, OUTPUT); // Initialize the BUILTIN_LED pin as an output
Serial.begin(115200);
setup_wifi();
client.setServer(mqtt_server, 1884);
client.setCallback(callback);
}
void loop() {
if (!client.connected()) {
reconnect();
}
client.loop();
}