I bougth this July /08 they replace the mattress Nov /08 due to sagging. A year later doing the same thing. Now I have this mattress that is sagging about 1 3/8" again. The tech came to look at it and took pics. goes back to the store they tell me there is nothing wrong with the mattress. I want action on this, this not acceptable. Please clear this matter up asap. I will be going on vac. for two weeks, on Feb. 27 /10 returning Mar.13 /10