Jumps in final file when recording wit naudio and C#

I have developed a win forms application using Naudio and C# it has two buttons, one for start recording and other for stop recording. My problem is that the final audio file (WAV) has jumps, and with jumps, I mean that some seconds are lost in the middle of the recording, for example, if I record a narration which text is :

“the fox jumps over the lazy dog” In the wav you listen something like “the x jum over the og” or “the fox ps the la dog” I googled a lot to find a solution and did not find yet.

Please help me to solve

This is my code:

IWaveIn wi;
WaveFileWriter wfw;
int length;
String NomArch;
int idLamina;
int idPlan;
OleDbConnection connection;
string DBPath;
string pathApp;

Boolean Cargando = true;
void wi_StartRecording(String pNomArch = @"C:tempsonido.wav")
{
wi = new WaveIn(WaveCallbackInfo.FunctionCallback());
}
wi.WaveFormat = new WaveFormat(44100, 1);
wi.DataAvailable += new EventHandler<WaveInEventArgs>(wi_DataAvailable);
wi.RecordingStopped += new EventHandler<StoppedEventArgs>(wi_RecordingStopped);

wfw = new WaveFileWriter(pNomArch, wi.WaveFormat);

wi.StartRecording();
}

void wi_StopRecording()
{
wi.StopRecording();
wfw.Dispose();
}

void wi_DataAvailable(object sender, WaveInEventArgs e)
{
wfw.Write(e.Buffer, 0, e.BytesRecorded);
wfw.Flush();

int seconds = (int)(wfw.Length /
wfw.WaveFormat.AverageBytesPerSecond);
length = seconds;
}

void wi_RecordingStopped(object sender, EventArgs e)
{
if (wi != null)
{
wi.Dispose();
}
if (wfw != null)
{
wfw.Close();
}
}

private void btnRecord_Click(object sender, EventArgs e)
{
wi_StartRecording(NomArch);
btnStop.Visible = true;
btnRecord.Visible = false;
btnStop.Focus();
}

private void btnStop_Click(object sender, EventArgs e)
{
wi_StopRecording();
btnRecord.Visible = true;
btnStop.Visible = false;
}


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