I have a 2008 Newmar Kountry star with 4 slides. One slide has been "repaired" by the manufacturer twice and by the dealer twice. They say the slide floor is "sagging" and even though they have made 4 attempts to fix it, they can't. The slide is scratching the ceramic floor. The entire ceramic flooring and underlayment has been replaced due to cracked tiles. The problem is now getting worse. Has anyone else had this problem with this model, or is this a unique problem? thank you for any information you can share.