Why my RabbitMQ Connections (in Kuberntes) are getting Blocked / Idle after 2 Hours?

Question

I'm testing my Backend and using a StatefullSet Cluster of 3 RabbitMQ replicas , and using a client to test the Backend with "15" Users per Second.

We're using the NPM Package of

"amqplib": "0.10.3"

After around 2 hours I get that all my RabbitMQ connections are getting closed , as follows:

After around those 2 hours I'm left with only a 4-5 active connections and the reset are idle and then they become blocked.

Here is my RabbitMQ connection handling:

 import * as amqplib from 'amqplib'
 import { Connection } from "amqplib";

 async createChannel() {
    if (!this.connection) {
      this.connection = await this.connect();
      if (!this.connection) return;
      this.connection.on('close', () => this.handleConnectionClosed('close', {}));
      this.connection.on('error', (error) => this.handleConnectionClosed('error', { error }));
      this.connection.on('block', (blocked) => this.handleConnectionClosed('block', { blocked }));
    }

    if (!this.connectionChannel) {
      this.connectionChannel = await this.connection.createChannel().catch((error) => {
        this.handleConnectionClosed('close', error)
      });
      await this.connectionChannel.prefetch(config.queue.concurrentMessages);
      this.connectionError = null;
    }
    return this.connectionChannel;
  }

And this is the Queues properties:

  async init(): Promise<void> {
    try {
      this.setSettings();
      this.queueName = this.settings?.serviceName;

      await this.createRejectedMessagesExchange();

      this.exchange = await this.createDirect(this.settings.exchangeName, {
        durable: true,
        autoDelete: false,
        [this.settings.deadLetterExchangeHeaderKey]: this.settings.deadLetterExchangeName,
      });
    } catch (error) {
      throw error;
    }
  }

Why are all the connection getting idle or blocked within this short period of time ?