Exception while copying a file to network driive

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I using the routine below to copy file to a network drive for a regular
backup process. Before calling this routine I using another function to check
the presence of the LAN connection and the server where the network drive
exists.
Although of this check I am sometimes(5% of times) getting an error saying
"Could not find the U:\...\File.ext" or part of its path" Although the
network dirve is available and accessible by windows explorer and the path is
correct and
existing.
I would apreciate if some one can help me troubleshooting this unexpected and
non understandable exception.

Private Sub CopyFile(ByVal DstBasePath As String, ByVal SrcFileInfo As
FileInfo)


Try

Dim strDstFile As String = DstBasePath &
SrcFileInfo.FullName.Substring(2)

Dim DstFileInfo As New FileInfo(strDstFile)
If DstFileInfo.Directory.Exists = False Then
DstFileInfo.Directory.Create()
End If

Me.c_Status = String.Format("Copying {0}{1}To {2}", SrcFileInfo.Name,
vbCrLf, DstBasePath)

Me.c_Progress += 1

Me.c_FCD_Status.Invoke(SrcFileInfo.Name, Me.c_Progress, Me.c_Status,
True)

If DstFileInfo.Exists = False Then
SrcFileInfo.CopyTo(DstFileInfo.FullName)
ElseIf DstFileInfo.LastWriteTime <> SrcFileInfo.LastWriteTime Then
SrcFileInfo.CopyTo(DstFileInfo.FullName, True)
End If

Catch exIO As IOException

Catch ex As Exception

End Try

End Sub
.

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