As said, clean and lube. The motor works off resistance. It is made to stop if anything is in the way, ie your foot, etc. After lube, use your hand to help them up and down. Do it multiple times and I believe your problem will go away. Good luck.
2019 Thor Miramar 37.1
2013 Honda CRV Toad
2004 Georgetown XL 370TS - Sold