Never had an issue of any kind with my G20SF. Shot every kind of ammo you could imagine through it, lots of Double Tap more recently, but did put in 20 lb springs as I shoot it often with high power loads. Got the springs to take some abuse out of the slide mostly. Not sure what happened with your gun, but I have never experienced it (with my Glocks).
"The wilderness holds answers to questions man has not yet learned to ask"