It is not uncommon to have a little leak down, that is what I was informed when I contacted Lippert regarding some snapping and popping. (Another issue) Their suggestion was to re-level every few weeks.
Regarding the side to side level. If you have the auto leveling system you may need to manually set the unit to level and re-zero level the system. When we got our Silverback it was terrible, I had to do a re-level of the system. Has been good since. FYI I used a 4 foot level on the floor to get it correct each way. I don't trust the small exterior levels.