What cause burned FET driver and FETS on 9920

[tom255]

first specs:
Motor-9XL
Controller-9920
Gearing 44/14
Battery-TrueRC 5S2P 8000mAh (one brick)
UBEC- dont remember but some new generaition with radio noise shield up to 5S (5V/6V)
Lipo Saver: Dimesionengineering LipoShiel
Capacitor: 1000uF 16V

One day i assembled my HB LSP and made some free runs (Wheels on air) tried brakes and etc But this day i tested about 10 mins all seems ok And decide next day assemble it fully.
Next Day i went to Electronics shop, bought some switches wires and Capacitor. I asked 6V cap but they dont have it and i decide to take 16V cap
I am connected all and cap to spectrum RS3000 AUX + and -
Assembled it and tried to make final free run and all seems ok a pressed the triger tried couple high runs and brake and one longer run (5-6sek) not on full throttle (prevent balooning and suddenly heard like cogging sound then controller stoped and smoke escaped from ESC i tried disconect battery fast as possible ( but you know tight DEANS) it takes couple secs do disconect. And after that nothing works
BEC disabled by removing middle wire
I checked all wires, wires OK no mistakes all is made like on BrianG homepage.
Now i am think what caused it. Can it be Capacitor its only thing that i connected after first run becouse first test OK and i ran motor much longer than second time next day. Can 16V cap do it?

I disassebled ESC and found fried FET DRIVER (IR2102S) and 3 FETS (IRF7413) on other side. I am want to buy new fets and fet driver and assemble ESC again. Realy hope to fix it.

I finished technical highscool (studied HIGH voltage) but know how basic low voltage components works and pretty handy with welding tool. Made before some simple amplifiers for subs and filters. I know basics. So i am not so newbie in that. But in other side not proffesional

But question again what you think can 16V cap fry it?