When did you take delivery and when did you first notice problems? I haven't seen too much about Suburbans on this topic, I'm going to read all 400 posts today but I guess it doesn't matter which model you get, they all have a chance to have problems. I ordered a 2015i LTZ, Sable, Texas package, max trailer option, roof cross bars, 22 in wheels, cocoa/mahogany interior. No sun roof. I expect to see it sometime late Jan or Feb. I'm going to need a 24 hr test of it before buying like someone else mentioned. I hope that by then they figured out what's going on, if not my only other choice is an Expedition and I don't know much about them.