vesc disconnected during detection

symptom:

I can run "RL" and "Lambda" detection in the "Motor Settings"->"FOC" tab successfully.  During the "Lambda" detection process, the motor does spin.  

The problem is when I try to

"Wizards" -> "Setup Motors FOC" then, after hearing some sound, "VESC Disconnected During Detection"

I checked the voltage for the MCU, there is no obvious drop during the detection. For my case, it's not a MOSFET related issue. 

fix:

in conf_general.c

    // Increase switching frequency for flux linkage measurement

    // as dead-time distortion has less effect at higher modulation.

    // Having a smooth rotation is more important.

#ifdef HW_HAS_DUAL_MOTORS

    mcconf->foc_f_zv = 25000.0;

#else

    mcconf->foc_f_zv = 40000.0;  <<<<<<<------------change to your foc_f_zv, for my case 30000.0

#endif