Why does .NetFramework console exe program shut down by itself after 1 day idle?

Question

I have a Console application that is ran on the background. Its a simple server that built using NetMQ library and NLogger that works locally.

I ran the program using taskScheduler with the following command schtasks /create /sc ONSTART /tn "TheServer" /tr "C:\\Temp\TheServer.exe" /ru System

As you can se, now it will start every time the desktop is turned on and it will run as System (It means that we can see TheServer.exe is running as background through Task Manager)

Question:

My timeline was like the follows:

1. My PC was on on Friday morning (starting of Business day - 09:00 in the morning)
2. I didn't turn off my PC on Friday before I go back from work
3. Monday morning, I checked my PC and TheServer is already gone

Does anyone know why it happens and how to prevent it?

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FYI, I write my code as follows

Program.cs

class Program
    {
        [STAThread]
        static readonly NLog.Logger log = NLog.LogManager.GetCurrentClassLogger();
        
        ...

        static void Main(string[] args)
        {
            try
            {
                var inst = Server.GetInstance();
                inst.Bind();
                inst.Run();

            }
            catch (Exception e)
            {
                log.Error(e.Message);
                log.Error(e.StackTrace);
                throw;
            }
        }
    }

Server.cs

class Server
    {
        private NetMQ.Sockets.ResponseSocket rSocket = new NetMQ.Sockets.ResponseSocket();
        static readonly NLog.Logger log = NLog.LogManager.GetCurrentClassLogger();

        ...

        public void Bind()
        {
            try
            {
                //bind is only for the Responder or The Server
                rSocket.Bind("tcp://127.0.0.1:32325");
            }
            catch (Exception e)
            {
                log.Error(e.Message);
                log.Error(e.StackTrace);
                throw;
            }
        }

        public void Run()
        {
            while (true)
            {
                 var message = server.ReceiveFrameString();
                 Console.WriteLine("Received {0}", message);
                 // processing the request
                 Thread.Sleep(100);
                 Console.WriteLine("Sending World");
                 server.SendFrame("World");
            }
        }
    }

I wrap my code at Program.cs with try-catch. But nothing written in the log

Then

I tried to find some information at the Window's Event Viewer. But there are no related information why TheServer.exe stopped

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Update: Looks like I found what @PMF means.

Then one extra question. . .

Is there any way to do that through command prompt?

I tried to read https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/schtasks-create Looks like if I didn't set the /du when create the task, it will be forever (?). CMIIW

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UPDATE

So yes, we decided to recreate this TheServer.exe as Windows Service. Thanks for your input and opinions.