Not an uncommon problem with the 34's. Mine did the same thing no matter what ammo was used. I'd suggest a call to S&W.
The best defense is a good offense, and I'm really offensive.
S&W Club #92, Snubbie club #92, The 21 Club #92,
RIA 1911A-1,XDs .45 ACP, S&W 28-2, S&W model 49, Winchester model 70, Ruger 10/22