When I press the volume up or down hotkeys on my Microsoft Natural Ergonomic 4000 keyboard(s), there is a delay - sometimes of up to 30 seconds, before windows reacts to it. At other times they work instantly.
I think the delay happens if I have not used the keys since last reboot - or maybe after the computer comes out of sleep.
I have observed this same behaviour on 3 different PCs and 3 different physical keyboards (all same model). They have all run Windows 7 64bit, and I have not installed any special software, other than what Windows itself decides to install with the driver (Intellitype).
How can I fix this issue?