Normally when talking about something that is happening now we use present progressive, and when we talk about that happens as habit, custom etc. we use 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?