I haven't seen a single document. I'd bet a paycheck 99% of them are ND's and resulting coverup.
Read the appendices in some of the lawsuits. The one where the "walking his doggie" guy in NH shot himself in the leg had a whole bunch of
them. I don't believe dog walking guy but theres literally too many other examples of discharges to ignore them all. There was another one where a dude was
sitting in the back of some kind of police van in MA and it fired while he was just seated, etc. Of course it doesn't help that there doesnt seem to be a solid root cause analasis of a lot
of these. I would hazard a guess in some cases its because of things like improper holsters, etc.
Let me put it this way, when looking at most other NDs, Glock, M&P, HK, whatever.... usually there's an easily established chain of negligence.
"shirt got caught in holster" / "some other blind reholstering snafu"
"rainjacket lanyard thing got caught in holster/trigger guard"
"idiot tries to catch unholstered, live, falling handgun"
"guy did stupid shit to internals of gun, dropped gun on ground, gun fired because the mods f***ed the gun up"
etc, etc, ad nauseam.
There are usually consistent themes to most NDs with an easily pointed finger.
With the P320 theres often a lack of clarity. Including a number of NDs that have happened while the guns were holstered.
Odds favor a lot of this stuff being bullshit, but its happened often enough that it can't be all bullshit.