I've never had anything but a failure to lock the slide back on the last round on my P30. No other issues at all. It also only happened on S&B ammo, so I'm blaming the ammo.
The ammo in the mag Federal Hydroshok 124gr. I don't handload where I live now due to space limitations. I have reloaded in the past.
I have a CZ-52 as well.
I've had some issues with it then the firing pin broke. It was one of those "unbreakable" firing pins, not a factory pin. I replaced the firing pin with a Harrington CZ-52-2 competition firing pin. I had to mill out the pivot on the extractor so it wouldn't engage the return spring(can be done with a file). I highly recommend everyone do this to their 52s. The trigger goes to around 3 lbs, gets smoother and break much nicer. It "breaks" the decocker, making it a second trigger but who cares, that happens to these 52s anyway when they wear.