Absolutely gutted about this, my pristine car now looks like this inside. I've only just noticed this whilst cleaning in the rear but I think the summer very hot days did this, the glue used to attach the material has gone off/dry.
I carefully peeled at a small area near the rear window and it separated from the glue quite easily (but did kinda stick back again).
I've seen various dubious methods on youtube to fix this using spray adhesive but how much work would it be to remove the headlining and replace with a known good one? I'm guessing it gets fitted first at the factory and therefore needs a lot of the pillar trims etc removing (and the risk of broken clips etc).
