Same here, after the oreo update, my sensors are not functioning anymore. in samsung service center says that my motherboard is already damaged. It cause 264plus dollars. So disappointing.
I'm also facing similar problem. Poor support and now the Samsung is completely money oriented consumers. They have not satisfying their customers. After Oreo update my Wifi cannot turn on. Now it is proven Apple have taken serious attention about their existing phones and updates. However Samsung is only worried about their latest releases. I always recommend not to update OS versions. At least you have to wait for couple of months to get actual feedback from end users.