Success at last!! Still a couple of 16016 ???s

[Batfish]

I have had a similar "cut out" problem with my 12012 controllers. I now believe it's due to current spikes. It seems to happen most often when I jab at the throttle or brake. The vehicle will stop responding to input for 2-5 seconds, beep, then be back to full control.
The controller doesn't get hot, nor does the motor, so I've ruled out thermalling.

It happened almost regularly in my MGT, geared 15/51 with the center diff. I've since switched to 12/51 and will see how it reacts this Thursday night at the track. The 12/51 gearing didn't cut out in my back yard at all during testing.