[Motor31]

The jack legs creeping down are a symptom of the failure of the internal seal on the jack. That seal prevents the fluid from moving from the extend side of the ram to the retract side.

In short you need to get it checked asap. The later stages of this symptom will be the dropping of the nose when parked. The jack will extend and lift the trailer to level but later on will start to bleed down internally. There is no leakage outside the ram to see. The solution is to replace the ram as Lippert does not rebuild them. The one that drops first is usually the bad one. This can take some time to really develop so start to watch for small increment drops in the rams. I used a magic marker to make a line on the exposed part of the ram where it came out of the exterior housing to see when it started to drop.

It's also very bad to have the jacks extend during travel. If it hits the road you will grind off some of the ram and if you hit a speed bump with the extended jack you can do some major damage to the rig.

I made a post about 2 years ago with the fix to the situation (ram removal and replacement) and a link to the pix that were taken by my buddy and posted in their blog.