If you shoot any gun enough, you will encounter a malfunction. It may be because a magazine spring goes soft on you, or because the ammo is out of spec/bad, or because gunk in the firing pin channel gets you a light strike, or because an ejected case bounces off something and flies back into the closing action.
A glib person might say that one should never trust a gun that HASN'T had a malfunction of some sort, because that only indicates that you haven't shot that gun enough to form an opinion.