Send it in for warranty repair. I don't own anything in 9MM and have not had any issues with my new Shield M2.0 yet. It's chambered in 40 S&W.
I have a M&P 9 Sheild and have had no problems with it. I would send it back for repairs too.I purchased my M&P 9 Shield Plus Bugout kit a few months ago. After a few hundred rounds a the range The frame cracked from the trigger to the magazine release button. Has anyone else had this occur?
Not personally, but one of the LGS employees I sometimes talk to has seen some frames with hairline cracks that were returned. Can't guarantee it was the same model though, or what ammo was used.... Has anyone else had this occur?