Putting wood between the jacks and the ground did not work for me. But when I put the rubber Pad Foot pads between the jacks and the ground or between the jacks and the wood ...no more pops.
I had this same problem in my new Montana 5th wheel with the Lippert Leveling system. Lippert send me a fix by replacing some of the hydraulic fluid. But that had no effect. I soon figured out that with the temperature changes the metal was expand...