I found that not all silicone lubricants are the same. When we bought our A back about 5 years ago, I had the same problem. I called the dealer and talked to their service manager. He told me to extend them fully then wipe them with a rag then use a very fine steel wool to get any other grime off then wipe with a clean rag. He then told me to use a silicone lubricant. I went to my local Ace Hardware store and bought
CRC Industrial Food Grade Silicone.
My procedure has been to apply some silicone just before bringing them up and have had no issues up until last year when I ran out of my beloved CRC Industrial Food Grade Silicone!. I bought another brand on sale at Menards and thought no problem...silicone lube is all the same.
Well...when I used the new silicone, I started having problems raising the jacks. I did the thing my service manager told me to do but they were still very sluggish! So, off I went to my local Ace Hardware store and bought me a new can of CRC Silicone. I cleaned the jacks and lubed them and have not had any issues any more!