ksm3316x stops on STIR setting

If your KSM3316X stand mixer runs fine at other speeds but consistently stops shortly after starting on STIR, it’s almost certainly an electrical or control board issue, not a mechanical one. The STIR setting uses lower voltage and torque, relying more heavily on the governor or phase control board to regulate power. A failing governor, faulty phase control board, or worn carbon brushes (less likely but possible) can cause the motor to cut out under the low-load condition unique to STIR. Cold start issues point to failing electronic components that stabilize as they warm up at higher speeds. I’d bet on the phase control board; swap it out first.