Stutter at start (Sur-ron Light Bee X and Sabvoton 72150)

[Syms65]

Hi
I have a realy bad issue
I’ve just install my Sabvoton 72150 with UKC1 screen display on my sur-ron Light Bee X 2021
Hall test is ok and the motor spin good with no charge but when I’m on it and I make 0km to full speed, my motor stutter for 2 second at the start and after that, no problem until the rest of the run.
Sometime I can hear a “clac” before stutter.
I have tried a lot of different settings but nothing make it disappear
I have tried all phase possibility but nothing make it disappear
Thanks for the help !

[Syms65]

Here is the vidéo of the issue
https://youtu.be/L9nkwO5zdUQ