Hi Wengendude,
Which make and model of mattress did you purchase?
Do you know the details of all the layers inside your mattress? It’s also possible that there are other layers or components in your mattress besides just the innerspring and latex that could be part of the problem as well.
Brass has made some very good suggestions (and similar to what I would make as well) and as he suggested I would check everything that was between you and the floor to find out whether the issue was in the latex comfort layer. As he suggested … I would also rotate the topper if that’s possible as well. Putting the mattress on the floor can help confirm whether the issue is in the bedframe or foundation under the mattress. The goal is to use a process of elimination as much as possible to confirm which layer or component is the underlying cause of the problem.
I would also talk with the retailer/manufacturer of your mattress as well to see what they suggest because some of them are more responsive and helpful when it comes to non warranty issues as well and they may also have some suggestions.
While all foam materials will soften over time … latex will soften less and more slowly and is more durable than other foam materials in the same firmness level although it’s always possible to have a defective layer (defects tend to show up in the first year or so).
If your process of elimination confirms that it’s the latex then the component post here includes the better sources I’m aware of where you can purchase any type and blend of latex layers in any thickness and firmness level that you choose and as brass also mentioned for significantly less than the price you were mentioning.
Phoenix