Power cut off on foil assist

Hi everyone
I am Kafi from canary islands
I built a foil assist with
-flipsky 6384 with 2 blades propeller
maytech esc 160A waterproof
12S4P molicel p45b battery
I still have radical power cut when I stand up on the board , especially when its a bit choppy
can’t find the solution¨¨
need some advices
Thanks a lot

You say especially when its a bit choppy. Sounds like a loose contact. First of all I would check all connections.