What\'s happening to my topper? In the last few months, I've noticed that the grooves in my topper have been shedding whatever the factory used to fill them in. I'm talking about the filler that was applied to the seams on the topper. It's peeling off and out, and looks really dry. Has anyone had a similar problem, and, if so, what kind of filler have you used to fill the seam grooves back up with?