I have been experiencing the same issues. Random shut downs failure to start the ESC up. I have spent nearly six weeks trying different combination's of receivers, programming, receiver packs, wiring, batteries and motors.
After all of this I finally was about to give up in disgust and contact Novak for an answer or my hard earned money back
then......
I unplugged the fan harness from the ESC and plugged it into my receiver auxiliary port. All my problems disappeared
I have no idea why this would make such a difference unless the fans are injecting electrical noise directly into some vital component or circuit within the ESC. I do have the sensor cable and the fan cable loomed into a bundle but the only thing I have changed is where the supply to the fans plugs in.
Novaktwo may be able to ask the techs at Novak for an answer cause i sure can't see why.....