PN Racing 32-T Motor only lasts about 5 seconds

[n7plus1]

before you have to let it sit for another 10 seconds to run it again.

Its a street board, 2x3 FET stack.

Full throttle lasts like 4/5 seconds and you have to let it sit to get another 4/5 seconds out of it. I did my own FET stacking. Is this a problem with the FET's? Did i ruin some while stacking...IE - leaving too much heat on them too long while installing them?