wind noise

07 malibu, I had a ride in the rear seat the other day and noticed significant wind noise at the top rear corner area of the door seal. This ends up being right beside my head. I checked carefully for damaged or poorly adjusted door seal or window seal. Everything looks like it fits and seals properly, yet this very noticable noise. Both rear doors do this. the drivers side seems worse though. Has anyone else had this? Is this a common problem ? I guess I may have to get My dealer to check it out. Hopefully it will be covered on warranty.