I am having this exact same problem. As soon as I updated to PIE, my Galaxy S8's bluetooth stopped working properly. When I try turn it on, the Bluetooth button (in notification pull down menu) is highlighted. If I then close the notification menu and swipe it down again, the button is no longer highlighted. If I don't close the notification menu, it will stay highlighted but will ever actually turn on. The only way I can get it to work is to turn it on while my phone is changing to airplane mode (sometimes it won't even work when my phone is in airplane mode, I need to press during the 3-4 seconds it takes to changd to airplane made). I was really hoping Samsung may be working on a fix for this but given their lack response to this issue on their forum it appears unlikely. It seems we may have to go to an online tech website like CNET or Techradar and see if they can get a response off Samsung, because not having Bluetooth working on a modern flagship phone is a pretty damning story that will be hard to ignore to be honest.
... View more