Airmatic really bad if you don't have a warranty very expensive to fix. I had to replace both in the front. One of them was making a clanking noise over bumps and the other one was not working properly. If you like driving with the sport mode this can cause your airmatic shocks to go a little quicker (around 25K to 30K ) they usually need to be replaced. I was driving and my dashboard started to flash red to pull over car was to low. I don't know how many miles you have but I sure hope you have warranty.
Hope this helps.