@shaddack wrote:
I had a servo controller who got an epileptic fit when trying to move too fast.
The power supply was not sufficient. If the motor went full-power, it pulled the voltage down enough that the microcontroller reset, and sent a control pulse in a different timing. The servo then tried to go to a new position, also on full power, and the cycle repeated until I either cut the power or the random position commands went close enough that the power had chance to recover.