This past summer, Lippert issued a Lipsheet on this problem. Go to
http://www.lci1.com/support/leveling...veling/levelup
Then go to the Lipsheets and scroll down to 0295 ADDING ANTI-STICTION FLUID TO LCI HYDRAULIC SYSTEMS
This will give instructions on solving the popping from the Level Up system. I added the CAT product and that stopped the popping.
0291 LCI HYDRAULIC OPERATION FLUID RECOMMENDATION at the same location provides Lippert's recommendations on what hydraulic fluids to use in their systems.