I have the same problem with my jacks at times. While the jacks are down, I take auto transmission fluid, put on a rag, wipe down the extended jack. Then take another clean towel and clean off the transmission fluid. This leaves them very slick. I also take a cotton swab and using transmission fluid clean the seals above the extended rod. The reason for using transmission fluid is because it is the same fluid as used in the jack hydtrolic system and will not hurt the rubber seals. This works for long time. I think what happens is when the jack is extended, it gets crud on the rod and the wiper seal when bringing in, the jack does not wipe all the crud (dirt, sand, etc) off the jack.
Also my 4 jacks takes about 4 minutes to come in. The back ones are the longest because they are farthest from the motor. I was told this by a HWH tech.
2015 Flagstaff Super V Trailer
Towing with F150 Crew cab 5.0L