Latest Illustrator update (25.1) holding on to closed files

After I have finished with a file and I close the file, I cannot Move or Delete that file since the latest update.

I'm receiving a

"This action can't be completed because the file is open in Illustrator"

message.

This also happens if I open a file and close immediately without making any changes....

My only work around is closing the whole application, move or delete the file, then reopen the application.

This is very frustrating and time consuming as I deal with a few hundred files/day.

Before the latest update, I could close the file (leaving the main application open" and do what i like with the files, Move/Delete etc

Has anyone else come across this ? or know how I can get this fixed ?

Any help would be massively appreciated.....