[slow bob]

i had the same problems with my nimh s when running brushless off them i also had a set of orions but i had the top speck 4200 mached set and i was running a sensorless 7400kva mamba brushless system

i got about 12 runs with them on differnt days before i had the same problems as you

then i swiched to lipos with a high c rating and havent had any problems with the car since apart from smashing it into things at 70mph lol