A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data
I have absolultely the same problem since 2-3 months.
Started immediately after Office 365 update - I am sure about it as it tells me "please close outlook one note excel word" to apply updates.
And within 1 -2 hours of the update I noticed this annoying change of behavior on absolutely all files - including empty / new ones.
Or files which I use since years, and know perfectly well have no "today()" or similar command inside them, so they never prompt me to save them if I have not modified them.
This is a problem, and a total time waster - because sometimes I want to not save (experimental changes) I've made - and not this fake prompt makes me start thinking each time I close a file - have I made changes really, do I want to save them.
Leading to either lost data, or save something wrong in the file (e.g. pressed some button by mistake, and overwrote the contents of some cell).
Or just wasting my time to start CTRL-Z ing to see the latest changes, and do I want to save them.