I've had only one experience with S&W's CS & that was back in late 1990s. They got it fixed & back to me pretty quickly. It was a Performance Center J-frame, FWIW.
When Smith moved their HQ to TN, they left a lot of folks back in Mass. No clue where their warranty repair center is, someone can chime in with that if they know?
While it does sadden me to learn of Smith's sorry performance, it doesn't surprise me. They're not alone in this, sorry to say. Anyone who has had to make multiple repair trips to a dealership for a vehicle warranty repair will testify to this, IMO.
For S&W, the bean counters have long since taken control. QC was probably the first section to fall under the "efficiency" standards most mfg companies use these days. I would imagine the warranty dept is also under the same pressure to "clear" x-amount of warranty tickets per day/week.
As for "gunsmiths", I would wager large sums of $$ that they're NOT grads of a certified gun smithing school (Colorado School of Trades, for example). I would wager Smith have sent some of them through their "armorers' course" & called it done. I would also wager that most of them are probably under the age of 30 as well. Lack of experience = lower wages paid = more profit/lower costs to the company = happier shareholders = less pressure on the company execs. That's just a sad reality these days.
I'm somewhat thankful that the TN S&W HQ is only about an hour from me, straight up Hwy 411 North. I have bought only 1 or 2 brand new Smiths in the last 5-6 years, all being revolvers. The rest were used guns, but in good shape. So I have been spared this multiple return headache.
OP, were I in your shoes, I would try to find the warranty dept manager's name & phone number. I would have a detailed list of the dates the gun went in & came back & give him that info. Be polite, he's under pressure from his bosses too. He's probably having a difficult time getting qualified help as well, like many repair facilities.
I agree there's absolutely no excuse for a gun to go back & forth 4 times for the same issue(s), IMO. Personally, *I* would've taken a few vacation days & driven there with the gun for a (ahem)
personal discussion with someone.
My .o2