I have had similar issues with my Glock 42. Long story short, much of the available ammunition is not running at SD velocity and won't fully cycle the slide 100%.

The G42 and BG are both designed primarily as SD pistols and have heavier recoil springs installed which will cause issues with some of the 'plinker' loads that we practice with.

I hate having trust issues with a firearm that was purchased for SD duty and it will probably take a few thousand rounds with zero malfunctions before I decide to EDC my G42. If it keeps giving me fits, it's gone.