We just bought a 2013 Yukon XL Denali back in July and one of the things we liked about it was the ability to connect my wife's phone via blue tooth and not need to use a separate hands free device. When my wife calls me using the blue tooth connection, I hear a squealing sound in the background almost like when the ignition would interfere with radio reception. If she turns off the blue tooth, the noise goes away. Have any of you experienced this and if so, were you able to find a resolution? I have not pulled the unit to see if there are any loose connections after having some work done on the Rear Seat Entertainment system, but am planning on doing that this weekend.