Glock's had been out for around a decade before anyone took serious note of the fact that if you dropped them hard on concrete the slides popped off. The TFB story is a little contradictory in places, but I'm not willing to discount it. Could be a real issue, or nothing at all; time will tell.
And even though I support the Army's decision of the 320, I fully expect flaws in the pistol will be discovered when it reaches wide spread use in the military; but I would expect that with most any pistol they adopted.
