Our Solitude S Class has had perfect slide operation until now. When we returned from our most recent trip, the living room slide (booth/lounger) would not go out, it only clicked. We used the tool to manually open the slide and extended it about an inch and then the slide went out as usual. Everything was level before we tried to extend, in order to unload the trailer. We put the slide in again, and same thing, it would not go out until we gave it a nudge with the slide crank tool. What could be causing this and how do we correct it?