Have you tried all the suggestions in this thread?
If you have and nothing helped, I will also have you contact ASUS technical support for further assistance.
That's great that you were able to fix it.
I was able to update my keyboard multiple times in the armory but that issue still persists. They might've found a fix after I RMA mine so I will never know if that would've fixed mine. 😓
Sorry of my poor english at first. I had exactly the same issue. My PC was in idle and suddenly start to opening apps and typing "itself".
I bought the keyboard in january and two month later I got the problems.
My keyboard is in local ASUS service actually but no response since a month...