Ram:

I've never had the sheeting lift, but I also have never used any adhesive for sheeting foam other than "Southern Sorghum."

You didn't say how long the plane was lost - if dew hit it the moisture might have gotten inside and caused the lifting. But I would expect that to be on the upper surface only, or perhaps just a little around the edges on the lower surface where the water might have seeped.

But it really sounds like you just had poor adhesion, for whatever reason.

Bill.