I have a 2010 Equinox LTZ for 3 weeks and noticed about a week ago that the headliner inside the cab had disconnected from its supports and had begun to sag down. It was especailly prounounced by the first dome light by the rear seat. There is a 2nd set of these conical section between the 1st dome light and 2nd dome light where this has also happened. Evidently GM utilizes conical supports glued to the headliner that have magnets on the other end. The glue is not sufficiennt to hold the headliner. Brought it to the dealership and there was a GM bulletin specifying a fix with a new glue. it is special order so I will have to bring it back. Supposedly they have to remove the headliner from the vehivccle to fix. Dealership tried to use the double sided tape for an interim fix but after an hour that failed also. I'll keep you updated when they get the new glue.