Hi Matt and welcome. This issue was corrected since pre-pandemic. Cheers and stay safe!

I wonder how much of this spontaneous firing was really operator error If you get one contact sig to see if it has been updated they will check by S/N

A quick Google search yielded this.
Did SIG fix P320?
No, as of April 2023, Sig Sauer has not recalled the P320. However, Sig Sauer has implemented a “Voluntary Upgrade” program through which owners can “upgrade” their P320 at no cost. The upgrade consists of reducing the weight of the trigger, sear, and striker while adding a mechanical disconnector.Apr 17, 2023