Rapid Mouse Movement When Dragging LineShape Endpoint Via ShapeContainerMouseMoveEventhandler Causes Disconnect Between Mouse and LineShape

I am calling shapecontainermousemoveeventhandler, shapecontainermousedowneventhandler, and shapecontainermouseupeventhandler with (Nothing, e) as parameters from within their respective Form 1 mouse events (see code below), and can successfully change LS color and mouse cursor when the mouse is nearby a LS endpoint.  

When I drag a selected LS endpoint slowly there are no issues.  However, if I whip the mouse pointer quickly while trying to move the LS endpoint, the mouse pointer will depart the LS endpoint leaving it wherever the disconnection occurred on the form.   Is there someway to

  Private Sub Form1_MouseMove(sender As Object, e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseMove
        ShapeContainerMouseMoveEventHandler(Nothing, e)
    End Sub
  Private Sub Form1_MouseDown(sender As Object, e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown
        ShapeContainerMouseDownEventHandler(Nothing, e)
    End Sub
    Private Sub Form1_MouseMove(sender As Object, e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseMove
        ShapeContainerMouseMoveEventHandler(Nothing, e)
    End Sub

  Public Sub ShapeContainerMouseMoveEventHandler(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs)
        For Each ls As LineShape In Me.SC.Shapes 'Lines
            If MouseIsNearBy(ls.EndPoint) = True Then
                SelectedLS = ls
                SelectedLS.BorderColor = Color.Red
                ' Me.Refresh()
                NearLineEndPoint = True
                ls.Cursor = Cursors.Hand
            End If
            If MouseIsNearBy(ls.EndPoint) = False Then
                ls.BorderColor = Color.Black
                ' Me.Refresh()
                NearLineEndPoint = False
                ls.Cursor = Cursors.Default
            End If
        Next

        If NearLineEndPoint = True Then
            If (dragStartPoint) Then
                SelectedLS.StartPoint = New Point(oldStartPoint.X + e.X - oldMouseX, oldStartPoint.Y + e.Y - oldMouseY)
            End If
            If (dragEndPoint) Then
                For Each c As Control In Me.Controls
                    If TypeOf (c) Is PictureBox And dragEndPoint Then
                        If e.X > c.Left AndAlso e.X < c.Right AndAlso e.Y < c.Bottom AndAlso e.Y > c.Top Then
                            dropline = True
                            droplinex = c.Left + 2
                            dropliney = c.Top + (c.Height / 2) - 12
                            deltaxinsidebutton = e.X - droplinex
                            deltayinsidebutton = e.Y - dropliney
                            oldEndPoint.X = droplinex - e.X + oldMouseX
                            oldEndPoint.Y = dropliney - e.Y + oldMouseY
                            SelectedLS.EndPoint = New Point(droplinex, dropliney)
                            droplineobjectname = c.Name
                            dropcontrol = c
                            Exit For
                        Else
                            If dropline = True Then
                                oldMouseX = (e.X - droplinex)
                                oldMouseY = (e.Y - dropliney)
                            End If
                            dropline = False
                            SelectedLS.EndPoint = New Point(oldEndPoint.X + e.X - oldMouseX + deltaxinsidebutton, oldEndPoint.Y + e.Y - oldMouseY + deltayinsidebutton)
                        End If
                    End If
                Next
            End If
        End If

    End Sub

 Private Sub ShapeContainerMouseDownEventHandler(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs)
        If NearLineEndPoint = False Then Exit Sub

        If MouseIsNearBy(SelectedLS.EndPoint) Then '(SelectedLS.HitTest(MousePosition.X, MousePosition.Y)) Then

            oldMouseX = e.X
            oldMouseY = e.Y
            oldStartPoint = SelectedLS.StartPoint
            oldEndPoint = SelectedLS.EndPoint

            ' dragStartPoint = MouseIsNearBy(oldStartPoint)
            dragEndPoint = MouseIsNearBy(oldEndPoint)
            If (Not dragStartPoint AndAlso Not dragEndPoint) Then
                'If not drag either end, then drag both. 
                '    dragStartPoint = True
                ' dragEndPoint = True
            End If
            SelectedLS.SelectionColor = Color.Transparent
        End If
    End Sub

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