What caused this?

I know this isn't a Mopar, but I don't want to make the same mistake when I paint my Mopars. Two years ago I painted my wife's Murano. It was the typical primer/sealer then base/clear. Everything looked good for a year and then last summer the paint on the roof and hood started to bubble and on the roof the clear even cracked. The sides of the car were only affected to a very minor degree.

When I started to sand the clear off of the roof the paint smelled like fresh paint at times. That...

What caused this?

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