My Kwickie steps started erratically operating. When the door opens they sort of extend but not fully AND they intermittently pulse in the forward position. So the door opens and they operate like there is a continual on/off pulse. This happens when I open and close the door. In each open/close period of operation they pulse 8 times then that sensation will stop. Then when you close the door the same thing happens. I just replaced the controller and the same thing happens. The mechanical part of the steps are not bound in any way. Actually these steps are about 3 months old but they have the original motor and gear box. Any ideas or is there someone that had this happen?