Excel VBA macro works randomly - excel

Question

i need some advice regarding this macro.
This macro cuts and copies from "LATURAP" sheet, rows if specific conditions are met. exmpl. starts with number 170889 and so on.
Problem is that, when i run this macro, it will only works once when i have imported this to excel.
Can somebody explain what i'm missing here?
Sub Laturap()
Dim i As Integer
Application.Calculation = xlCalculationManual
Application.ScreenUpdating = False
Application.DisplayStatusBar = False
Application.EnableEvents = False
a = Worksheets("LATURAP").Cells(Rows.Count, "A").End(xlUp).Row
For i = 3 To a
'selection from LATURAP to 1708
If Left(Range("A" & i), 6) = 170889
Then
Worksheets("LATURAP").Range("A:J").Rows(i).Cut
Worksheets("1708").Activate
b = Worksheets("1708").Cells(Rows.Count, "A").End(xlUp).Row
Worksheets("1708").Cells(b + 1, 1).Select
Worksheets("1708").Paste
Worksheets("LATURAP").Activate
.........

Answer 1

You could try this(comments added in code)...
Sub Laturap()
Dim ws1 As Worksheet, ws2 As Worksheet, i As Long
Set ws1 = ThisWorkbook.Sheets("LATURAP")
Set ws2 = ThisWorkbook.Sheets("1708")
x = 1
With ws1 'wrap your code in the worksheet variable
For i = 3 To .Cells(.Rows.Count, 1).End(xlUp).Row 'you can assign the last row as a variable and use it, this cuts down the lines of code
If Left(.Range("A" & i), 6) = 170889 Then 'check the first 6 characters in each cell in Col A for the value
With .Range("A" & i).Resize(, 10) 'if a match select the range in the row from Col A to Col J using resize.
.Copy Destination:=ws2.Cells(Rows.Count, 1).End(xlUp).Offset(x, 1) 'copy the range pan paste to the first cell in ColB in ws2
.Clear 'clear the range in ws1
x = x + 1 'increases 1 to paste to the next empty row, must be within the If statement
End With
End If
Next i
End With
Application.Calculation = xlCalculationAutomatic
Application.ScreenUpdating = True
Application.DisplayStatusBar = True
Application.EnableEvents = True
End Sub