No one on this forum has indicated they’ve had a P320 discharge in such a manner, the thread is merely opening the very well known issue up for discussion. The P320 release was bungled and sig had to issue a recall due to reports of them drop firing. Apparently whatever they did to fix the drop firing is a case of the cure being worse than the illness, as now they apparently go off while in the holster! BTW tons of online forums, including thefiringline and thehighroad, have had a number of threads discussing this during the drop fire issue and recall.
I read other forums and I have not seen anyone on any of those forums report that one of their P320's went off without the trigger being pulled. Generally, every time you read about an AD by a cop, they swear up and down that they never touched the trigger, but most pistols don't simply go off by themselves. Therefore, I am taking with a grain of salt what is alleged in the lawsuit. I love cops, but given the potential loss of job or at least face, I understand why they never seem to call an AD what it typically is - an ND.