VBA Script Stops Part Way Through File List - vba

Question

I have the following VBA code meant to loop through a given folder and compile all files of a certain type into one single worksheet.
Sub cons_data()
Dim Master As Workbook
Dim sourceBook As Workbook
Dim sourceData As Worksheet
Dim CurrentFileName As String
Dim myPath As String
Dim LastRow As Long
Dim lRow As Long
Dim i As Long
Application.ScreenUpdating = False
Application.DisplayAlerts = False
'The folder containing the files to be recap'd
myPath = "path"
'Finds the name of the first file of type .xls in the current directory
CurrentFileName = Dir(myPath & "\*.txt*")
'Create a workbook for the recap report
Set Master = ThisWorkbook
For i = 1 To Master.Worksheets.Count
With Master.Worksheets(i)
lRow = .Range("A" & .Rows.Count).End(xlUp).Row
If lRow > 1 Then .Rows("2:" & lRow).ClearContents
End With
Next i
Do
Workbooks.Open (myPath & "\" & CurrentFileName)
Set sourceBook = Workbooks(CurrentFileName)
For i = 1 To sourceBook.Worksheets.Count
Set sourceData = sourceBook.Worksheets(i)
With sourceData
LastRow = Master.Worksheets("Sheet1").Range("A" & Rows.Count).End(xlUp).Row
lRow = .Range("A" & .Rows.Count).End(xlUp).Row
.Rows("2:" & lRow).Copy Master.Worksheets("Sheet1").Rows(LastRow + 1)
End With
Next i
sourceBook.Close
'Calling DIR w/o argument finds the next .txt file within the current directory.
CurrentFileName = Dir()
Loop While CurrentFileName <> ""
MsgBox "Done"
Application.ScreenUpdating = True
Application.DisplayAlerts = True
End Sub
This script works fine on certain file types, but for some reason when running it on a list of text files with a standard format (some of which are duplicates) it stops and presents the most recent entry it was working on in a separate Excel sheet. Is there any obvious reason looking at the code that this might be happening?

Answer 1

You need to kill old processes and discharge resources memory by adding after :
Set sourceBook = nothing
After
sourceBook.close
Hope this can help