Low voltage will cause this as will old grease. Many times people keep spraying the steps with light grease (which kwikee recommends) the grease will get old and thicken up. Our dealership always sprayed with WD40 as a cleaner.After you get all the lube points sprayed, open and close the door several times, let sit for awhile, then respray. Do this about every year. inbetween times lube with a light grease in a spray can. Make sure you get under the coach and get all pivot points. Also the motor clevis.
1998 Pace Arrow 35 ft. F53 Ford V10 2012 Honda Civic toad
15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.