Fair enough obviously a real issue considering that it is not just you but many other in this thread, that are posting the same or upvoting I do wonder what software, or and electricity grid you are all on and if you are typing from a war zone though.
It has happened to me too, mind you. Once. It was some sort of word processor, in the 1990s before autosave. Been spending my days on a computer since then for work and hobbies, can't say I remember a single other occurrence after that.