My father has a new Walther P99 with about 1000 rounds through it. He just got it back from Walther...it was going full auto... So far, he has had three magazines blow up. All are the latest MecGar. Two had the plastic bottom plate fail. One time the ammo dumped during shooting and the other broke when the magazine hit the dirt...not cement. The third failure resulted when the spring pushed the follower so high that it stopped the slide from locking back on the last round. He only had four magazines and now one. What's up with these magazines?