Every six months or sooner, they are suppsed to be lubricated, use Wd-40 or the recommended oil per manfacturer. I clean contacts on door once or twice year when remember. Turn of master/house switch and even then steps most likely are powered on, find the fuze in the box, pull it with steps extended, and then and only then check the electrical connections putting electrical grease on those (NO-OX-ID-Special A on amazon). This should solve problems unless motor is going out, not real common but not unheard of either. Let is know.