Our 2012 Gulfstream Visa has an integrated structural foam and luan type flooring (it is like a foam, luan, vinyl sheet sandwich). Suddenly in the last 6 weeks, I noticed a small area, now multiple areas where the foam/structural material below the vinyl sheet layer is coming UNGLUED/UNATTACHED! This means we are suddenly walking on just the vinyl in multiple spots around the kitchen, couch and bathroom -- I can feel some structural boards/steel joists in between the sagging spots. This is catastrophic -- we are full time -- any info on this? Is this a known issue? We have no idea what could have suddenly caused this -- ants? Humidity? HELP!