By jam, do you mean failure to feed into the empty chamber or failure to extract the fired round, impeding the new cartridge from chambering? When they exchanged slides, did you receive a new barrel?
I have two P-32's and pretty much use Fiocchi FMJ. I experienced occasional failure to feeds, so I polished the barrel feed ramp & inside the chamber. Start out with 300-400 grit sandpaper, progressing through 600-800 and 1000-1200. You can wrap the sandpaper around a pencil or small dowel and polish the ramp in the direction the bullet feeds. Same with the chamber. In and out, instead of around. You're not looking to remove metal, rather smooth any ridges that the bullet may drag on. This procedure seemed to have cured my occasional failure to feeds. Hope it works out for you.