It's possible that the P320 issue is overblown, like Flapp said the pistol has been out for nearly a decade with millions made and the issue being made only now. On the other hand, having stock pistols go off in holsters is an issue even if it is remote. We trust the gun is safe in a holster.
The bigger issue is SIG is handling this issue very poorly. Very secretive and not being up front like other manufacturers. Not addressing the discharges caught on video. The "it ends today". And calling the initial trigger issue fix an "upgrade" versus a recall. No one can trust Sig and their good reputation is going down a cliff.
The reason ranges and instructors are banning P320s is liability even if they don't think it's a big issue. If a person is injured by a P320 discharging and the range/instructor allowed the pistols knowing about the past incidents, they could be held liable in a lawsuit.
Actually, "a" problem was identified early in the model's life. The P320 was introduced to market in 2014 (I got one from OGC when they first got them in -- and it was discounted!

). In 2017, SIG offered a voluntary "upgrade" service free to all early P320 purchasers. i sent mine in for that. The 2 big differences i noticed were the beefy trigger was replaced by a very thin trigger to reduce its weight. Part of the theory was that at a certain height and angle, the trigger could continue traveling after the gun stops as it strikes the floor due to inertia. The other thing i noticed was it no longer had an audible "clickl" when pulling the trigger whether or not the striker was in firing position -- like you see on TV shows when some sound guy adds a click for each pull of the trigger on an empty Glock

. it sounded more like a Glock after the upgrade when pulling the trigger on an uncocked pistol: quiet.
So, while i can't say for sure the cause is the same, the symptoms have been known for over 8 years. Did SIG replace a few parts as a work-around to treat the symptoms as they were being reported, or did they continue testing to see where a real problem might exist?
There was a video i saw that says a former SIG employee submitted a patent application to address this specific issue of uncommanded discharges in P320s. i think that was in 2016, just before the voluntary upgrades. My conspiracy side is trying to tell me that SIG chose not to fix the problem properly because the former employee is asking for half a billion dollars to let then use his solution. if he was given the patent, those normally are enforced for 7 years. 2025 - 2016 = 9. If it took over 2 years to process and make official, or if SIG fought the patent application due to the guy being a former employee (proprietary knowledge), the patent may be expiring now, and SIG might all of a sudden announce they have a fix!
i think it's just now getting the amount of press it is because it's been issued to so many law enforcement and military members, and because SIG is continuing to tell us the gun has no defects that would cause the discharges people have reported or 'replicated" -- just like you said:
handling it poorly.