Curious if you ever diagnosed what specifically was causing the problem? Every one gets a lemon once and awhile, but sounds like you’ ve has several.
I’m not sure what it was. It wasn’t just one caliber either. I owned 2 10mm’s (#20 & 29) and a 9mm (19).
The 10mm’s didn’t like FMJ’s or FN rounds. The 9mm would do the same thing occasionally (though not as often) with JHP’s. The Glock guy claimed I was limp-wristing the guns, but that couldn’t be because I’ve owned XD’s & XDM’s (which are almost identical) and never had any malfunctions with those.
I never did find out and sold them all off. You seem to lose confidence in a product after multiple failures. I know others bet their lives on these, but I won’t ever buy another one. JMHO....