[Cant Normally Play] - Game Keeps Alt Tabbing

Dear sir/madam,

I have re-installed 9Dragons today to make a come-back to the game.
Sadly the game keeps alt tabbing itself out and returns it to my Task Bar.
This happens so often that I can't even normally create a character or get in the game anymore.

Do you have any clue how to fix?

Res: 1920x1080
Ram: 8 GB
CPU: Intel i7-4790
Video Card: GTX745 4 GB
OS: Windows 10
64 Bit OS/Processor.

Installed in default location "C Drive"

 

Edit: ONLY HAPPENS IN FULL SCREEN MODE
1920x1080 which my monitor supports.

 

Edit 2: Still happens just not noticing it anymore that badly. when windowed on low res.