The headliner support just aft of the sunroof seems to have come undone and as a result the liner is "sagging." Has this happened to anyone else?

 

I am seeing the same thing on mine but the material doesnt sag, it still seems to be stretched out. When people sit in the back they push up on the headliner. Takes some headroom from the back. Is this how yours is?

 

Sounds like the same thing. You can push it back up and feel a clip that it should be held in by, but for whatver reason that clip has failed.

Not a big deal, just something I will mention next time it is in for servicing.