Intermittent VBA macro error - vba

Question

I have written the below code to cycle through my worksheets as a kind of slideshow to use in a sales department. The code works perfectly when I step through in debug mode, however when I run the macro it only works intermittently, occasionally getting to the selecting of the worksheets without having reactivated the screen updating application function.
Here is the code I have created so far:
Sub Runshow()
Dim ws As Worksheet
On Error GoTo exit_
Application.EnableCancelKey = xlErrorHandler
For Each ws In ThisWorkbook.Worksheets
ws.Protect
Next
Application.DisplayFullScreen = True
Application.DisplayFormulaBar = False
ActiveWindow.DisplayWorkbookTabs = False
ActiveWindow.DisplayHeadings = False
ActiveWindow.DisplayGridlines = False
ActiveWindow.DisplayHorizontalScrollBar = False
ActiveWindow.DisplayVerticalScrollBar = False
Application.Calculation = xlManual
Let y = 0
Do Until y = 80
Application.ScreenUpdating = False
Workbooks.Open("c:\users\admin\downloads\crm.xlsx").Activate
Application.Calculate
ActiveWorkbook.Close savechanges = False
Application.ScreenUpdating = True
ThisWorkbook.Activate
Let x = 0
Do Until x = 23
For Each ws In ActiveWorkbook.Worksheets
ws.Select
Application.Wait (Now + TimeValue("00:00:10"))
x = x + 1
Next
Loop
y = y + 1
Loop
exit_:
For Each ws In ThisWorkbook.Worksheets
ws.Unprotect
Next
Application.DisplayFullScreen = False
Application.DisplayFormulaBar = True
ActiveWindow.DisplayWorkbookTabs = True
ActiveWindow.DisplayGridlines = True
ActiveWindow.DisplayHorizontalScrollBar = True
ActiveWindow.DisplayVerticalScrollBar = True
Application.Calculation = xlAutomatic
End Sub

Answer 1

I put together some simple code that does something similar, and works well. You can build out from here - ask any questions if there's anything you don't understand.
Sub Slideshow()
Dim ws As Worksheet
PrepareView True
For Each ws In ThisWorkbook.Worksheets
ws.Activate
Application.Wait (Now + TimeValue("00:00:10"))
Next ws
PrepareView False
End Sub
Function PrepareView(status As Boolean)
If status = True Then
ActiveWindow.DisplayWorkbookTabs = False
ActiveWindow.DisplayHeadings = False
ActiveWindow.DisplayGridlines = False
ActiveWindow.DisplayHorizontalScrollBar = False
ActiveWindow.DisplayVerticalScrollBar = False
ElseIf status = False Then
Application.DisplayFullScreen = False
Application.DisplayFormulaBar = True
ActiveWindow.DisplayWorkbookTabs = True
ActiveWindow.DisplayGridlines = True
ActiveWindow.DisplayHorizontalScrollBar = True
ActiveWindow.DisplayVerticalScrollBar = True
End If
End Function