Mine did exactly the same when I had a burst air bag. The fault put it on the bumpstops even after changinbg all the bags. I also fitted manual inflation valves and after pumping up to roughly the correct height, it stayed there and worked perfectly the 250 miles home. It stayed up after switching off but went on the bumpstops on starting up the next day. After clearing the faults with Mr Wilsons magic software, it was all OK. It would seem that, even with faults in the system, it will still work OK providing you don't stop and put the handbrake on or switch the engine off. Handbrake on and/or starting the engine will put it on the bumpstops.
