I went through all of the above steps and then found out it was my batteries. I even rebuilt my steps with new spacers and bolts, new motor, and installed the stabilizer kit for the motor and drive. Nothing helped consistently until I replaced my batteries. I would put a meter on my batteries while operating the steps to check the voltage drop. I don't remember what mine was but the minimum voltage to operate should be in your manual for your steps.
2014 Georgetown 351DS