Anyone else have a problem with the floor panels in the rear of wagons wanting to bow upwards? Every panel in the rear does it in my car. The carpeted panels were glued to the foam from the factory but over time the things have all curled in on themselves and peeled the glue off the foam. I took a heat gun to the panels (they are plastic) and they flattened right out, but as they cooled they bowed upwards again. Anyone know any tricks to keeping them flat?