First, as many of you are very aware, the magazine of a semi-auto can cause more problems than sometimes believed: on that subject, this link has some information.
The ejection problem: he found this video showing one way to fix it yourself.
I've got one magazine that occasionally winds up with a round sticking up vertically with the rim stuck in the feed lips; the others have always fed just fine. Like with anything else, you can get a mag with a problem.
On the ejector, I thought of messing with it myself, but didn't for two reasons:
First, in case it was something unusual, wanted S&W to be aware of it(turns out that wasn't a problem), and
Second, the damn thing was new and this should have been caught before it left the factory, so I wanted them to fix it.
I should add one more: I could just see breaking the ejector and then having to return it...
I will warn that Bullseye's site is about as Unsafe for Work as you can get, so be warned; he's over here.