How do you use hydaulic levelers?

I had power gear on my previous coach manual only and on my present coach which has both full auto or manual options. I believe m trumpet is on the right track as if the unit is solid when you first level, and the rocking comes after the rig sits for a while you have a valve or solenoid that is not holding pressure and alowing fluid the bleed back into the reservoir. As hydraulic systems go these are not super complex but when under pressure they can be dangerous. I would find a shop that's competent in RV systems and have them take a look. Power Gear can help you with manual for your unit. They can also recommend a shop in your area.
let us know how it goes