위에 분 말씀대로,
엑셀이 저장되면서 Selector 가 바뀌는게 아닐까싶네요.
lease note that the Microsoft Office 2016 version 1708 (Build 8431.2079) changes the window title of files that are being edited and saved from “FileName.xlsx - Excel” to “FileName.xlsx - Saved”. After closing the file, the filename reverts to normal.
This may cause some problems if your automation project uses selectors which contain the window title. For example, the following selector no longer works if your Excel version is the previously mentioned one: < wnd app=‘excel.exe’ cls=‘XLMAIN’ title=‘FileName.xlsx - Excel’ /> . To prevent this issue, we recommend using a dynamic variable selector.