Enel, once the ammo has displayed issues in more than one manufactuer's gun, I would consider that strong evidence that the issue is the ammo, not your guns.

I have used thousands of rounds of Winchester 124 NATO and IMI 124 NATO, but never tried the PPU. Both the Winchester and IMI bear the NATO cross-in-circle head stamp. I can't tell from your photo if the PPU case head has the NATO cross-in-circle stamp? If not, regardless of what the box label says, the ammo is not actually NATO spec. I shoot a lot of 9MM, and wonder whether some foreign ammo marketed as "NATO" actually is?