Because its a naughty computer in need if punishment.
Probably gaming related, keyboards and mice can only take so much rage before you need to go one up.
Have you not vented frustration on a peripheral/controller or in red blind rage turned the console/PC off?
8-ish hours is normal in Norway to. Allthough 8 - 15:30. With 30 min for lunch. 37,5 hours is a normal week for me.