2021 GMC Yukon AT4 purchased in February. We have had problem after problem. Most recently, mildew smell. After two months of searching (3 kids, thought it was food) found wet floor mats under passenger side weather tech mats. Weather tech mats never showed evidence of water or leak but carpet underneath is soaked with water and lots of white mildew. I have also noticed water sloshing around overhead after every rain. Advice on what to do or who to call? Our GMc dealership is horrible, I had an issue with the hydraulic lift and they never responded to my calls. Ended up having to go to our local Chevrolet dealership who helped right away.