if you are using esc version V3.0_101224STOCK ?
try reflash or newer on same 3rd Generation..
and prevent Flashing Firmware during Hot/Warm temp on esc!

But before you do that, please try run without sensored first to do run sensoreless, to detect same bug. if nothing hapened, try plug sensor wire without turning it off, and re run to check if there is a same problem.