That's pretty much the way it happens to me, too. (The screen flickers.)

But listen to this one.

Although I don't recall precisely what I was doing, an entire song disappeared and reverted to a previous song I had been working on about five minutes before!!

I'm almost certain I hadn't yet saved the current tune, and I'm not even sure that I saved that earlier one, since I was just tooling around. Pressing REDO -- not UNDO -- restored what I was currently working on.