An enormously irritating thing the Men's Shed iMac likes to do is, for no discernible reason, drop Bluetooth connection to its Magic Mouse then regain it. I've had enough. As the person responsible for the computer I'm going to get a $15 Logitech M100 wired mouse as a replacement. The USB ports on the aluminium keyboard aren't used, so it's not going to tie up one of the four USB 3.0 ports.