+1 for flexible panels
But seriously, take a level and carefully put it on the panels and see if there is any curvature. If they are curved, they can certainly pop quicker if subjected to some external forces or even a lot of heat. (like what Tyler2you said).
If they just used 4 clips (one per corner) it would be hard to get them to flex but if they used more clips, this could create the flex in the panel, along with some force to get all the clips to contact the roof skin.
When installing them, you will want the panel to relax before securing it to minimize this potential. It would pretty hard to get the rigid panels to flex but there is always a way to do things wrong.
Hopefully, they didn't screw the panels or clips down into the roof. They might have used all the caulking to adhere the panel clips to the roof. Sometimes I wonder if Airstream has an endless supply of caulking!