Run-Time Error 6: Overflow

Hello,

I'm getting a Run-Time Error 6: Overflow on the code below. It's strange because this code as been working perfect for 10 months and now it's spitting out this error. It stops on the "For Loop" where "R = Range("F" & p)". Can anyone please help me understand whats going wrong?

Thank you!

Dim i As Long
Dim p As Long
Dim Y As String
Dim W As String
Dim Z As String
Dim LR As String
Dim Cell As Range
Dim intCol As Integer
Dim NumDays As Integer
Dim var1 As String

var1 = "X"


LR = Sheets("Sheet2").Cells(Rows.Count, 1).End(xlUp).Row
Today = Date
NumDays = 10
dateStamp = "12/31/2020"


For p = 2 To LR
    X = Range("C" & p)
    X = Left(X, 1)
    R = Range("F" & p)
    R = Left(R, 10)


        For Each Cell In Range("F" & p)
            If Cell.Value = " " Then
                Cell.Offset(0, 0).Value = dateStamp
            End If
        Next
        
        For Each Cell In Range("F" & p)
            If InStr(R, "-") Then
                Cell.Offset(0, 0).Value = dateStamp
            End If
        Next
        
        If CDate(Cells(p, 6)) = Today + NumDays And X = var1 Then Range("C" & p).Font.Color = vbBlue
        
        
        'All cells in column loop that are marked are to mark the whole row that its in
        For Each Cell In Range("C" & p)
            If Cell.Font.Color = vbBlue Then
                Cell.Offset(0, -1).Font.Color = vbBlue
                    Cell.Offset(0, -2).Font.Color = vbBlue
                        Cell.Offset(0, 1).Font.Color = vbBlue
                            Cell.Offset(0, 2).Font.Color = vbBlue
                                Cell.Offset(0, 3).Font.Color = vbBlue
            End If
        Next
        
        
        ' All cells that haven't been marked are set to = ""
        If Range("F" & p).Font.Color <> vbBlue Then Range("F" & p).Value = ""
        For Each Cell In Range("F" & p)
            If Cell.Value = "" Then
                Cell.Offset(0, -1).Value = ""
                    Cell.Offset(0, -2).Value = ""
                        Cell.Offset(0, -3).Value = ""
                            Cell.Offset(0, -4).Value = ""
                                Cell.Offset(0, -5).Value = ""
                    
            End If
        Next
'
Next




    For intCol = 1 To 6 'cols A to F
        Range(Cells(2, intCol), Cells(p, intCol)). _
        SpecialCells(xlCellTypeBlanks).Delete Shift:=xlUp
    Next intCol
    

    Call BorderUp
    
'        Sheets("Sheet1").Range("A1").Select
'        Selection.CurrentRegion.Select
'        Sheets("Sheet2").Select
'        Sheets("Sheet2").Paste


        If Sheets("Sheet2").Range("B2").Value = "" Then Exit Sub
            


        Sheets("Sheet2").Range("A1").Select
        Selection.CurrentRegion.Select
        Selection.Copy
        Sheets("Sheet1").Select
        Range("A1").Select
        ActiveSheet.Paste
        
        Worksheets("Sheet2").Range("A:F").ClearContents
    

    
    Columns.AutoFit
    
Application.ScreenUpdating = True