They resolved the drop test issues on the P320. They claimed the Military version had a different trigger and never had the same issue.
I heard about the failure to feed ball ammo, but that was a year or more ago. I have no idea what the actual failure rate was.
I never heard of ejecting live ammo with the Sig. I have had that happen with my Walther PPQ 45 ACP. When shooting hot self defense loads. I had that happen a few times where the muzzle flip was bad enough the next round in the mag flew out. If you hold it more firmly, it did happen. If that gun weighs 30 ounces, 29.9 ounces of the weight is in the slide. So when it recoils, most of the weight of the gun is moving around. The 9mm pistols might be better, but I don't care for the 45.