Unprotect method fails using automation in excel 2013

I open an Excel spreadsheet using automation from MS Access. In the recalculate event, which fires first, I have the following code:
   
    Dim xSH1 as worksheet, rR1 as Range
    Set xSH1 = Worksheets("Sheet1")
    xSH1.Unprotect
    Set rR1 = Application.Range("CoverComments")
    rR1.UnMerge

This code works fine in Excel 2003. However, in 2013, the unmerge fails with an error 1004 (Object-defined error). I discovered that the failure was caused by the fact that the sheet was not unprotected.  I inserted an "On Error" to get around it and found that the second time through the recalculation routine, it worked fine. In between, the line of code that made the difference was

Sheet1.Unprotect

Does anyone know why one works and the other doesn't? I've got something like 50,000 excel documents with this code in it and would not like to have to make the change in all of them. Thanks in advance.
jhseymour113Asked:
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Saurabh Singh TeotiaCommented:
I don't see any problem in your code it should work...Can you ensure sheet1 is the right name of the sheet as sheet1 is the vba name of the same which is their in the vb module..

Also you are not specifying a password when you are un-protecting the same..I'm assuming your password is blank..

Saurabh...
jhseymour113Author Commented:
With no code changes whatsoever, the problem seems to have resolved itself. No I don't believe in magic, but I have no explanation. The system is working without a hitch.

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Martin LissOlder than dirtCommented:
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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