HiSUN Motor or ESC Problem

hi,
totally newB here,
Our board has stopped working this week. The company in China has been helpful with the spare parts, however I want to double check with witted ppl here if there is a better option out there for me when it comes to fixing this efoil.

When throttle is on, the motor is pulsing. Resetting the board a week before kinda helped us foling but then this method stopped working.

The battery is brand new, constantly outputting 53V at full chage (48v 30A battery)
ESC: $280
Mast+Motor: $680
+Shipping

wondering if there is a turnkey solution for us out there, maybe with ugraded parts that retrofit to the board and can easily be implemented by a newB.
Pls let me know

Cheers

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