Well, I have been through the entire motor tuning section again and have tested all the settings. I still only get the shaking/vibration but it will start and stop slower with a change in acceleration or shake/vibrate faster or slower with a change in velocity. I have been testing only a single motor at a time. I had to leave for an hour or so to go to a meeting and when I returned, the motor was extremely hot. l left it plugged in but there was no motion.
If I unplug the parallel cable, sometimes there is an audible hum from the motor and it immediately begins to get warm when the system is powered up.
Any suggestions?