I saw your post on discussions.apple.com, have you tried an SMC reset. Thats pretty messed up. Mine has an issue with Bluetooth where it just can't see any Apple Keyboard or trackpad (Logitech k380). It seems that the T2 might be the culprit to a lot of the issues on these new machines. When I spoke to the Apple rep, she asked me what troubleshooting steps I took, and I told her I think it's an issue with the T2, she immediately setup a private appointment with an Apple Engineer at my nearest Apple store, so on Saturday I have an appointment to take my Mini in. Have you spoken to Apple yet?