Its been a LONG time since Ive visited this site. My 2006 LR3 has had the same issue for over a year, I just bump it to neutral, cycle the ignition switch, put it back into drive and keep going. It does become an issue at night, when I turn the ignition off(momentarily) the headlamps go off/on. Im sure stopping and restarting the engine traveling down the highways isnt a great choice, but it seems to work. Oh, and I have replaced the battery, but that didnt fix anything either.
I took it to LR Cary, NC. They said it was an ECM, but I strongly disagree! My LR3, when it sits for a few days without being driven will lower to the stops. It does promptly raise when I start it again. My disagreeance with LR Carys Diag., was that when the vehicle isnt on, the ECM cant just decide to lower the suspension(I am aware it does level automatically, but the techs ive talked to say it shouldnt lower to the stops). Im not a tech, but I have come to believe that I have an air suspension bag, line, or compressor leak. After 50-100 miles the compressor gets tired of doing its job, says the hell with it, throws a fault, and the LR3 3 Amigos appear. As for when it sits still and lowers, I believe the LR3 has a continuous loop air system, so a small bag leak on left rear side would eventually exhaust the entire system causing it to lower. I may be completely wrong about all my assumptions, if so, someone around here will be sure to quickly correct me. Im ok with that too!
Eric, I sympathize with your aggrevations. Maybe someone around here can guide us to a solution. I know I would buy a spring conversion, if they were avail.
-Landon