My headliner is doing the same, but I haven't gotten it fixed yet. It isn't that bad yet though. I've read that it is covered under warranty, I've been too lazy to take it in. I've read that either they just glue it back or just swap it out completely. However, some members said that the problem occurred again after taking it to the dealership. Some people have fixed it themselves with 3M industrial double sided tape or gorilla glue epoxy. This is pretty much the gist of what I've read on here.
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