Need some input; slide does not stay put

nycsteve wrote:
Haven't had an issue in awhile, but got one Im hoping someone has some insight on now.
My Lance 2008 981 has 1 slide, a full wall (dinette and fridge). After 100 miles of highway driving, with no real rough road, my slide backed itself out 2 inches . It retracted normaly after the trip, seated itself evenly with no weird sounds. This is the second time this happened, the first a few weeks ago. Same deal, noticed about the same slide movement at the end of the day. But earlier in the day the first time, I was on the beach in soft sand and there was a bunch of bouncing. I thought the slide box jumped some gear teeth,if it has them, and that was the cause. Today there was no out of the ordinary bouncing.
Some observations that might help. The rear portion was out 1/2 " further than the front. The bottom on both sides was kicked out a little further on the bottom than the top ( I think that's the way the box sits though)
Anyone have any thoughts on whats up?

I had the same issue last year with my FW that has 4 slides. The problem was fixed while under warranty after they replaced the valve body and pump, they discovered that there were two slide hydraulic rams that were bad. The rams were leaking internally, the fluid is under pressure to hold slides closed but the rams leaked past the seals internally and the result was the leaked pressure pushed the slides out several inches. New rams cured the problem. You can also try bleeding the hydraulic system by extending the slide and retracting several times, maybe up to 10 times.