About 40 years ago I acquired a beautiful 12 gauge single trigger LC Smith that would go off when closing, or if you got it closed it would spontaneously discharge later. I took it to a gunsmith, in Berwyn IL I believe, who charged me $75 to fix it. I didn't fire it after I got it back and then later sold it to an acquaintence in Houston TX. Thankfully I'd kept the repair receipt and gave it to the guy I sold it to, because the POS later discharged both barrels while the guy was sitting in duck blind with it.
I haven't liked either LC Smiths or single triggers ever since.
Steve