Normally when talking about something that is happening now we use present progressive, and when we talk about that happens as a habit, custom, etc. we use the present simple. That is clear. But if I'm not mistaken I noticed that when people talk about working of device or machine -at the moment- they're used to use present simple rather than present progressive. They say:
"Why does it not work"
"Why is it not working"?
Does it reflect the norm or the most native speakers and it is like an idiom or is it just a mistake?