Ok.. ive tested alot and ive brought some conclusions.

• It indeed is not the game

The same is happening to me at Crysis 3. The problem is with games that can handle directX11.
The thing apparently is that because ive been using my laptop GPU running at 150%+ for 2 years now, it has a tendency to act up with DX11 games.
In non-technical jizzwazz and trying to explain in baby-talk... my GPU is normally in .. well.. you could call it "directX9 mode" .. when opening a game supporting DX11.. it needs to change to DX11 mode. Because of the massive overclock, this part is done slower and thus first crashes the game before changing to dx11 mode.

Ive found out this is easily avoidable by 2 things:

• I start up Arma3, close it immediatly and then start it up again (giving the gpu time to switch)
• I start up Arma3 in windowed mode (it wont crash then) and change it to fullscreen in settings.

But yeah.. apparently this isnt an MSi afterburner problem.. neither is it a gameproblem.
Its simply a problem with my GPU having taken quite some abuse for long periods :D
but now i know how to avoid it, it isnt really a problem anymore.