Client controle falhando

[Césarvix]

Ola Amigos tudo bem

Eu fiz um programa enviar dados para um roteador tudo funciona bem.

Tem hora os dados trava na hora envio,

Aqui esta o programa.Se tem error eu não consigo detectar

Agradeço ajuda.

Imports System.Net.Sockets
Imports System.Text
Imports System.Net.WebRequestMethods
Public Class Form1
    
 
    Dim out As String
    Dim isConnected As Boolean
    Dim ipadd As String
    Public my_client As System.Net.Sockets.TcpClient 'for router connection

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        TrackBar1.Value = 1500
        TextBox5.Text = 1500
        TrackBar2.Value = 1500
        TextBox1.Text = 1500
        isConnected = False
    End Sub

    Private Sub Form1_keydown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles MyBase.KeyDown
        If isConnected = True Then
            Select Case e.KeyCode
                Case Keys.W
                    Button7.Visible = False
                    out = "PC" & "A"
                    'SendStream(out)
                Case Keys.Z
                    Button8.Visible = False
                    out = "PC" & "B"
                    'SendStream(out)
                Case Keys.S
                    Button10.Visible = False
                    out = "PC" & "C"
                    'SendStream(out)
                Case Keys.A
                    Button9.Visible = False
                    'out = "PC" & "D"
                    SendStream(out)
                Case Keys.M
                    TrackBar1.Value = TrackBar1.Value + 1
                    TextBox5.Text = TrackBar1.Value
                    out = "PC" & "E" & (TextBox5.Text)
                    'SendStream(out)
                Case Keys.N
                    TrackBar1.Value = TrackBar1.Value - 1
                    TextBox5.Text = TrackBar1.Value
                    out = "PC" & "E" & (TextBox5.Text)
                    'SendStream(out)
                Case Keys.V
                    TrackBar2.Value = TrackBar2.Value + 1
                    TextBox1.Text = TrackBar2.Value
                    out = "PC" & "E" & (TextBox1.Text)
                    'SendStream(out)
                Case Keys.B
                    TrackBar2.Value = TrackBar2.Value - 1
                    TextBox1.Text = TrackBar2.Value
                    out = "PC" & "E" & (TextBox1.Text)
                    'SendStream(out)
            End Select
        End If
    End Sub
    Private Sub Form1_keyUp(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles MyBase.KeyUp
        If isConnected = True Then
            Select Case e.KeyCode
                Case Keys.W
                    Button7.Visible = True
                    out = "PC" & "E"
                    'SendStream(out)
                Case Keys.Z
                    Button8.Visible = True
                    out = "PC" & "E"
                    'SendStream(out)
                Case Keys.S
                    Button10.Visible = True
                    out = "PC" & "E"
                    'SendStream(out)
                Case Keys.A
                    Button9.Visible = True
                    out = "PC" & "W"
                    'SendStream(out)
            End Select
        End If
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        If ((TextBox3.Text = "") Or (TextBox4.Text = "")) Then
            'hist("Enter host and IP")
        Else
            Try
              
                Button1.Enabled = False
                Button2.Enabled = True
                SendStream("Cliente Conectado..")
                Button37.BackColor = Color.Red
                Button31.BackColor = Color.Red
            Catch ex As Exception
                
            End Try
        End If
    End Sub
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

        SendStream("Cliente desconectado..")
        Button37.BackColor = Color.Lime
        Button31.BackColor = Color.Lime
        Button2.Enabled = False
        Button1.Enabled = True
        isConnected = False
    End Sub
    
   Sub SendStream(ByVal out As String)

        Try
            Dim my_client As New TcpClient(TextBox3.Text, TextBox4.Text)
            Dim data As [Byte]() = System.Text.Encoding.ASCII.GetBytes(out)
            Dim stream As NetworkStream = my_client.GetStream()
            stream.Write(data, 0, data.Length)
            stream.Close()
            my_client.Close()
        Catch e As ArgumentNullException
           
        Catch e As SocketException
          
        End Try
        isConnected = True

    End Sub

   Private Sub TrackBar1_Scroll(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TrackBar1.Scroll

    End Sub
    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        SendStream(out)
    End Sub

     
End Class