I leave my laptop (three year old HP) on 24/7, never on battery, always plugged in. If I type in powercfg -a at the command prompt, it returns a value of S3. On more than a few occasions lately, when I return to it, I get no response to mouse clicks or keyboard. The mouse cursor will move, but that’s the only thing that will work – no clicks work, no keyboard presses work. I am left with powering down and re-booting, which restores all to normal.
Should I try other sleep settings? It’s not asleep when this happens. The screen is visible, not off.