This is a most interesting thread. I have a Brother NX 650-Q and have used mostly Schmetz and Organ needles. Both types have fallen out more times than I care to remember. It's usually because I've been driving full out (e.g., sewing strips) rather than when I'm creeping along trying to be sure to match seams or whatever. Disappointing that a machine that is designed to sew fast can't handle the speed.
I have always just plugged the needle back in and kept going. No problems.