It seems that most of the time the error occurs, it is because the sled is a the top of the frame. To me, this points to a power supply issue (or issue with the ability to supply power). I suspect that either the power supply cannot provide the necessary current (some people have upgraded their power supply. click here) or, if the motor controller is hot, it might be more susceptible to not being able to provide the necessary power. There’s some commmunity-based work on a new motor controller board that might help the problem (click here).
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