It's an intermittent occurrence. I fire a round and the spent case gets ejected. I fire the next round, or the third round, and the gun does not go off and therefore the slide does not cycle. I've got to manually eject the live round. Primer strike looks normal. Once a new round gets fed, the gun fires regularly. Pattern repeats shortly thereafter. I've had guys watch what I'm doing and I'm not limp wristing it. I shoot a 45 with no failures. And it also has a stock trigger.
Long time ago a fella passed on to me that malf's tend to be cause by the following, in said order. Dirt, Ammo, Parts (gun).
Regular cleaning, including disassembly is a standard part of any shooting session. Though the full disassembly type cleaning gets done at home normally. And of course it also includes relubing the vital bits. I can't imagine not doing so. So 1st rule out dirt as the cause of your issues.
Otherwise, there are just some weapons/models that don't work with one's physiology, regardless of how good your technique. There's one or two well known models that consistently malf on me, by means of a light strike. This with good ammo, and; a clean, bone stock weapon.
Speaking of which, if it ain't complicated, try switching your sidearm back to it's stock configuration for a few hundred rounds & see what happens. Might be the non-OEM parts, and or the smith.
BTW, what cleaners are you guys using that are eating polymer frames? And what polymer framed weapons are they eating? I've just always used brake cleaner, and it cleans well enough, while always having been safe to use. Knock on wood.