I bought a 2021 Telluride 2 months ago and immediately started experiencing a vibration at certain speeds. It initially felt like it’s out of line. Also hearing a chirping squeak from rear seat area. I see on the US sites that the vibration is a known problem in 2020 models. My dealer replaced the drive shaft and tires, with no success. Recently tried uncoupling the AWD and made it worse. Any suggestions? I’m ready to trade it at a loss.