I tried to run a pair of the original Proboat blue boxes, and they seemed to run
at a frequency that at 50% throttle, one would always cut out, then as i reduced
throttle, the stalled ESC would come back to life. Didn't matter how I suppressed them.
And, the motors I was running at the time, did not draw more than 2amps stalled...

I switched them out for a pair of different ESC, and use the blue boxes as back up
ESC in my pond side tool box, but never use them as a pair... [&:]