Two Glock 23's, 3 G27's and 1 G22, and not one has had these mystical function problems. There are two types of people, those who like Glock and those who to refuse they are better than the **** 1911.
On top of the .40's, I have to my credit a G32, G26, and a G30.
The reason you hear about more problems with them than anything else, is because there are more of them in use. Glock owns 80% of the US Police market.
Now to really piss you haters corn flakes, I bought myself a nice Sig 229, with night sights and two barrels (.40 and .357 Sig). Loved that gun, soooo accurate. Then one day I started practicing with my carry rounds. Speer Gold Dot 125gr .357 Sig. The .357 Sig is supposed to be the most reliable feeding pistol cartridge ever introduced, and in a Sig pistol you would expect perfection right ? WRONG ! It was one jam after another when trying to use hollow points in it. After that I no longer trusted my life with it, so I let it go be someone elses problems.
I shoot pistols weekly. After literally THOUSANDS of rounds from dirt cheap crap bought at gun shows, to Blazer Aluminum, to Winchester Rangers and Double Tap, I have yet to have one failure, of ANY kind in my Glocks.
I'm not denying the lack of support at 6 oclock on the .40 calibers. But the .357 Sig is fully supported. If you want pictures, I'll be glad to post them showing the differences in the .40 and .357 chamber support.