Graphic User Interface freezes after 2 mins

[firstoption]

Good day to all,
Please i need your support on how to solve this Problem.I developed a graphic user Interface with 37 trackbars.the trackbars are used to control Led brightness.The application works very well except that after 2mins it hangs.So i have to re-load it before it can be used again.The lines of code below is for two of the 37 trackbar.

private Timer _scrollingTimer = null;

private void trackBar1_Scroll(object sender, EventArgs e)
{
    if (_scrollingTimer == null)
    {
        // Will tick every 500ms (change as required)
        _scrollingTimer = new Timer() 
        {
                Enabled = false,
                Interval = 500,
                Tag = (sender as TrackBar).Value
        };
        _scrollingTimer.Tick += (s, ea) =>
        {
            // check to see if the value has changed since we last ticked
            if (trackBar1.Value == (int)_scrollingTimer.Tag)
            {
                // scrolling has stopped so we are good to go ahead and do stuff
                _scrollingTimer.Stop();
               myFtdiDevice.write(dataTowrite,dataTowrite.Length,ref  numByteswritten);

    int  percent =(int )(((double)trackbar1.Value/(double)reackbar1.Maximum) * 100);

    label2.Text = (percent.ToString()) + "%";

    data[0] = Convert.ToByte(percent);

    data[1] = 0x6A;

    myFtdiDevice.write(data,2,ref  numByteswritten);

             
                _scrollingTimer.Dispose();
                _scrollingTimer = null;
            }
            else
            {
                // record the last value seen
                _scrollingTimer.Tag = trackBar1.Value;
            }
        };
        _scrollingTimer.Start();
    }
}
private void trackBar2_Scroll(object sender, EventArgs e)
{
    if (_scrollingTimer == null)
    {
        // Will tick every 500ms (change as required)
        _scrollingTimer = new Timer() 
        {
                Enabled = false,
                Interval = 500,
                Tag = (sender as TrackBar).Value
        };
        _scrollingTimer.Tick += (s, ea) =>
        {
            // check to see if the value has changed since we last ticked
            if (trackBar2.Value == (int)_scrollingTimer.Tag)
            {
                // scrolling has stopped so we are good to go ahead and do stuff
                _scrollingTimer.Stop();
               myFtdiDevice.write(dataTowrite,dataTowrite.Length,ref  numByteswritten);

    int  percent =(int )(((double)trackbar2.Value/(double)reackbar2.Maximum) * 100);

    label3.Text = (percent.ToString()) + "%";

    data[0] = Convert.ToByte(percent);

    data[1] = 0x6A;

    myFtdiDevice.write(data,2,ref  numByteswritten);

             
                _scrollingTimer.Dispose();
                _scrollingTimer = null;
            }
            else
            {
                // record the last value seen
                _scrollingTimer.Tag = trackBar2.Value;
            }
        };
        _scrollingTimer.Start();
    }
}


 Is there any way i can adjust these code in order to prevent freezing.Thank you all for the usual Support.Best regards.
 Firstoption.

[Arjay]

Is myFtdiDevice blocking or operating in a different thread (from the UI thread)?