Is there any key combination or non-code trigger for the effect usually caused by the VBA statement Application.ScreenUpdating = False?

Multiple times within the past few weeks I've been doing something ordinary in an Excel document such as running a Find, and suddenly the screen will stop updating. I can always fix it by opening up the code editor (alt+F11) and entering Application.ScreenUpdating = True into the immediate window. But I want to know why this keeps happening and if there's a way to prevent it.

As far as I know, there is no user-created code/macros running at the time. I know for sure the last one that I was working in when it happened had no code attached.

Thanks,
~telyni