That's not the case, I'm using it on Windows 10 and have the exact same behavior. I only recently started noticing it I think because when I with it, I'm using a Logitech G13, so not using the keyboard itself as much.
WHen I got chat in game, and I touch the keyboard, the whole PC stops like when a BT device connects, then the keyboard/pc respond and I can type. Seems like it's less than 5 minutes of "idle" time before it happens. It'd be nice if it could tie itself to the window state/screen state.