This has only happened in the last couple of days after i connected my laptop to my stationary PC as a secondary monitor with Spacedesk. I have diconnected it again but the same happens. I have also been having problems with GTA V only playing at 1 FPS. This might be connected to my issue with Arma 3.
Setup:
PSU: Cooler Master G650M
Case: Corsair Carbide SPEC-03
Motherboard: ASUS LGA1151 ROG MAXIMUS VIII RANGER
CPU: intel LGA1151 Core i5-4690K @3,5GHz (clocked to 4,5GHz)
RAM: 4x HyperX Fury DDR3 1600Mhz
GPU: NVIDIA GeForce BLACK GTX 970