I have the Kirkland KS8 aids which are pretty much the same as the Rexton Adore, but uses replaceable batteries. I can’t say I have noticed what you are reporting, at least not exactly. Since you are saying it is both ears, I would say it is highly unlikely they are both defective.
Are you using an iPhone? Rexton/Signia claims it uses motion sensor input from a smartphone to change the programs automatically. They call it a 3D classifier4. At least in theory it is supposed to adapt to a vehicle environment. There is also a program which can be turned on called (i) Focus 360. I have found it to be a little more useful in a vehicle. It claims to suppress road noise, but also be sensitive to potential conversation from beside or behind you. So what I hear is suppression of noise, until someone speaks, and then the sound level goes up. Loud vehicles and bumps in the road can fool it, and let volume come up too, but in general it works pretty well. In particular I hear the air conditioning fan hiss to some degree. When the noise suppression kicks in and out, it almost sounds like someone is increasing and decreasing the fan speed, but of course it is not changing. It is the hearing aids changing gain.
Long story, but what I found is that I got used to how they work, and now appreciate how well they control noise. At times especially when I was using molds they can make it almost over quiet in a vehicle. That is another potential issue. Are you using open or closed sleeves. I find closed sleeves work better for me, combined with the Own Voice Processing trained and turned on.
There are settings on the amount of noise reduction and how fast or slow it acts. You should tell the fitter what you are hearing, and they may suggest some changes from the defaults. My thoughts would be to wait a couple of months until you get more used to them first. Turing them off when it is very noisy in my view is not a bad thing. I have mine programmed such that a long hold on any button will mute the aids. When I grind the coffee in the morning I mute them, and when I am traveling by plane I also mute them and use them as ear plugs! It is by far the quietest option.
Hope that helps some. Here is how I have my optional programs set. The fitter has to set them up. There is a choice of about 10 different options for programs.
