Check the USB controllers, the keyboard could get disconnected as the controller it's plugged into gets powered down?
edit - it's going to be a stupid laptop isn't it?
Nope, it’s my new desktop.
How do I check it?
Same as you did in the device manager settings for the keyboard but just look for the usb controllers. I'm on windows 7 but it's the same really.
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Check the USB controllers, the keyboard could get disconnected as the controller it's plugged into gets powered down?
edit - it's going to be a stupid laptop isn't it?