OP contact S&W. After they deny any problem, blame your maintenance and then blame your ammo, they will quietly exchange your 67's for free M&P pistols.
Thats what they did here. Then S&W will issue a press release announcing your agencies "adoption" of the new M&P pistol!
S&W's QC/QA may not be worth anything, but their PR folks are top notch.
Regards 18DAI.