Uso la siguiente macro y, a veces, el parámetro es un error demasiado largo. ¿Cómo puedo resolverlo

Sub BoldFirstLetterInSentence()
Dim s As Range
Dim doc1 As Document
Dim doc2 As Document

Set doc1 = Word.Documents("Doc1.docx")
Set doc2 = Word.Documents("Doc2.docx")

For Each s In doc1.Sentences
    If s.Characters(1).Bold = True Then
        Debug.Print s
        With doc2
            Selection.Find.ClearFormatting
            With Selection.Find
                .Text = s
                .Replacement.Text = ""
                .Forward = True
                .Wrap = wdFindContinue
                .Format = False
                .MatchCase = False
                .MatchWholeWord = False
                .MatchWildcards = False
                .MatchSoundsLike = False
                .MatchAllWordForms = False
            End With
            a = Selection.Find.Execute
            If a = True Then
                Selection.Font.Bold = True
            End If
        End With
    End If
Next

End Sub