PaulMar, I would have them check the battery, if they have already been through the suspension and can't find anything. When a battery starts to goes out on a LR3 it does funny things and it also goes out over a long period of time, not just over night; the two most common are to through a fault with the air suspension and the other is to through a fault with the transmission. Kinda of weird I know, but happened to me on a few occasions last year, and again last Thursday (right after I made a post about how good my new battery is). If they still have trouble making a diagnosis take it to pepboys or autozone and they will test the battery for free.
Another thing that has happened to me was "being over worked" by sitting in rush hour traffic for long periods of time. Every time I would inch forward on the freeway and stop, it would try to self level after a while it would just got tired and quit. Dealer never could figure it out and it still does it, so when that happens I just pull over and let it sit for a while.
Hope this helps.
"Man who say it cannot be done should not interrupt man doing it."
-- Old Chinese Proverb