Hi BigWind,
Thanks for taking the time to share your experience and I’m sorry to hear that your mattress didn’t work out for you as well as you hoped for. Based on your other post at least your daughter will have the chance to sleep on a latex mattress although it seems that she is somewhat “attached” to memory foam.
This is a very unusual issue with split layering and it can sometimes be a result of how the mattress was assembled (although in reading your previous posts I don’t think that this was an issue with you) but for those rare instances where it is an issue with the split layering then either gluing the two top layers together (if they are a different firmness on each side) or replacing them with a solid layer would resolve the problem.
If the foundation under your mattress is sagging then it would certainly affect the mattress on top of it and with a latex mattress … because of the durability of latex … that would normally be the first place I would look to resolve any sagging issues (see post #4 here).
If you were to put your mattress on the floor and it made a difference over the course of a few nights (a single night’s sleep can be an anomaly and may not be enough to identify a “pattern” in your sleeping experience) then it would be safe to assume that the foundation needed to be replaced or repaired.
Phoenix