C#

The semaphore timeout period has expired.

public static void Open_ActivePortWeWillUse(String Drone_StringNameFromUser)
    {
        SerialPort TempSerialPort = new SerialPort(Drone_StringNameFromUser, (int) SerialPortSpeed);

        ThePorts.ActivePort1 = TempSerialPort;

        ThePorts.ActivePort1.DataBits = 8;
        ThePorts.ActivePort1.Parity = Parity.None;
        ThePorts.ActivePort1.StopBits = StopBits.One;

        ThePorts.ActivePort1.DataReceived += new SerialDataReceivedEventHandler(OurBackGroundSerialPortReceiver);

        ThePorts.ActivePort1.Open();  // The "Sometimes" Error occurs here
    }

public partial class Login : Form
    {
        public Login()
        {
            InitializeComponent();
        }

        private void Button2_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void Button1_Click(object sender, EventArgs e)
        {
            if ((textBox1.Text == "puppy") && (textBox2.Text == "password"))
            {
                MessageBox.Show("Welcome Puppy", "Success",
                MessageBoxButtons.OK, MessageBoxIcon.Information);

                this.Dispose();
            }

            else
            {
                MessageBox.Show("Wrong username or password","Invalid Input",
                    MessageBoxButtons.OK,MessageBoxIcon.Error);
            }