Air Suspension Went Out

[MAC]

My air suspension is fine, but at 6000-7000 feet when I cold started the Hummer, "SERVICE AIR SUSPENSION" warning came on and stayed on. Once I stopped at some place, restarted, the warning did not come on. This happened several times. I am at 7,000 miles, 4000 miles since last oil change, I will take the Hummer in for oil change and have them update the software or chips. Thanks to the info on this subject here and in previous posts, I did not panic, otherwise I could've freak out, get out to check air suspension or cut short the ski trip to rush home.