Hi all, I have bought Mac mini i5/8/256 base model few days ago and got a bluetooth issue when connected my bluetooth headphones MDR-ZX770BT (after that I started to face the issue even without headphones connected, seems I used other port for my T3 SSD before). Everything gets disconnected frequently. So was experimenting and I found out that issue occurs when I plug-in my Samsung T3 to outermost USB-3 port. When I plug it to USB 3 near HDMI or any type-c than everything works fine. Tested it using all devices connected and run VM with Windows on the SSD.
My setup is 2 Asus MX27AQ displays (HDMI (2.0) and type-c->display port), Samsung T3 via USB 3.0 (currently put into type-c), Magic Trackpad 2 and magic keyboard 2 both space grey.
So, my advice is to avoid usage of the outermost USB port or use it for something that doesn't require power and won't have high load.