Wow, just wow. I see my wife’s bronco headliner is starting to let loose. I’m just going to pull it down and reapply with some 3M spray trim adhesive and see how that works on the offending panel.
Does your garage have any ventilation? I had the headliner of my F150 fail after a week in a garage with no ventilation. I'm not saying this is definitely the problem, but it's worth looking into.