I honestly think it looks UV/sun however I will await the response of my first question.
This section of the shed/lean to is 1/8" styrene core with .030" styrene roofing.
The other building is PVC.
They are two separate structures but go together…
Ok, Well once again it sure looks like sun damage from the picture. It sucks but I have been there especially with styrene. I have had pretty good luck with PVC board however there are two versions of PVC board UV treated and standard. When I did my firehouse build the roof warped like crazy because I used “non treated” .5mm or 1/4" PVC board. It didn’t take long in the sunlight.
I don’t think it’s sun damaged because a similar construction roof was sitting right next door in the same exposure and didn’t show any problems.
And I UV clear coated it.
Now the heat from the sun may have warmed up the roof and expanded it and because it wasn’t fully glued down, it may have warped with heat?
But I don’t think it’s UV damage. Styrene typically just turns yellow when exposed to UV.
I was kinda categorizing UV/ Sun damage as the “same” like I said in my original thoughts. You can probably try sticking it back out in the sun to warm it up and then poke small holes into the bubbled areas while soft. Then once good and warmed up move it to the shade to cool down. They may lay back down.
That’s certainly a different idea. 
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