Kristian: I have attached a picture showing the Windows version information, so it is certainly not Windows 10.
Gersen: When you said "Windows 8 goes into this weird "mode"", how does it happen ? is it when you try to switch task ? when Windows start ? or at random ?
If you can "control" it, I would suggest looking in the task manager to see if there are some "unknown"/Asus related task running and try to kill them. You can also take a look in the "Start-up" section of the task manager to see what is automatically started when Windows boot.
The thing is, I never figured out what triggers it, it has got something to do with where the mouse cursor is placed on the screen or something. Maybe a button combo, but that seems unlikely. I always tend to ignore OEM software, but I guess I need to check out the Asus software.
Edit:
Asus stuff installed on the laptop:
ASUS Instant Connect.
ASUS InstatnOn.
ASUS LifeFrame3.
ASUS Live Update.
ASUS Screen Saver.
ASUS Smart Gesture.
ASUS Splendid Video Enhancement Technology.
ASUS Tutor.
ASUS USB Charger Plus.
ASUS Virtual Camera.
ASUS WebStorage Sync Agent.
ASUSDVD.
ATK Package.
SceneSwitch.