Don't panic. This is a common problem with these cars! Most of the headliners drop so it is only a matter of time. Unfortunetly now it is your time.

I had this problem in the hot south Texas sun. Cost me about 120 dollars to get a new headliner from a guy in the business (don't buy a new factory part). He had been in business 40 years doing headliners and took him a couple hours to replace with new material. He said they must have used bad glue and didn't wrap it properly from the factory. All it takes is a little heat and humidity to start drying out the glue.

I suggest finding someone good to replace it. Then you will never have the problem again because it will be done right. Don't spend hundreds for a brand new OEM part because it is probably the same poor quality that the car came with.