In short I also believe that the incredible sales of new guns has created some QC issues with S&W, Ruger, Colt, taurus etc. There are 5 options one has.
1. Stop buying news guns altogether. (There are plenty older reliable models are still available.
2. Buy new, take your chances and understand that you may have to use the unlimited lifetime S&W warranty.
3. Write a letter to Smith & Wesson, express your issues and concerns with their QC and ask them what they can do to fix it.
4. Buy other new brands and see #2 above except for the (unlimited lifetime part)
5. Stop buying guns