King of the Mountain!

After less than 1 year of use, this mattress started to develop a hump down the middle. Can't flip the mattress, so the hump grows. Now at 3 years of use, it's like trying to lay on top of Mt Kilamonjaro, with distinct tendencies to roll off to either side. Both sides of the mattress have developed obvious impressions where we lay all the time. I have tried adjusting my body up or down or slightly more toward center, but it feels very uncomfortable and I always end up back in my little indentation. I am still getting a good nite's sleep (arthritis & back/neck muscle damage), but my husband isn't so much (onset arthritis). Probably going to contact the dealer soon, as it is obvious this will not last the 10 year warranty.