I'm not sure what he's doing wrong with his P320s, but I have probably upwards of 10,000 rounds (conservative estimate) through my 4 over the past 6 years in all manner of conditions, and they have all been superbly reliable. I also work with a bunch of other guys who use them...most don't shoot as much as me, but as a group a lot of rounds get put through them. I'm the armorer, so I'd know if there were problems. There have been none.
I can't say the same for the P365, and those get shot even less than the 320s.
I can't say the same for the P365, and those get shot even less than the 320s.