AZ Nomad wrote:

If no keys have been pressed after a while, it should be asleep.

Leave it to microsoft to design a keyboard whose sleep timer is
disfunctional. You can set it next to your windows PC whose monitor
fails to shut off 20% of the time. Creating a timer and reliably
counting down to turn off a monitor is beyond microsoft's technical
skills. I wouldn't expect them to be able to do it on a keyboard
either.

Or maybe they changed windows so it doesn't let the keyboard sleep right
anymore. You know, one of those "auto-updates" windows is so fond of.