Yellow spots on my screen while playing FFXIV ARR

Hello,

I often have GPU issues while playing FFXIV ARR. I get yellow spots on my screen, and only restarting the game resolves the issue (temporarily). It only happens with this game, any other game I play is fine.

Screenshots (had to make them with my phone, since the screenshot function in-game does not record these spots):

http://i.imgur.com/GNCoVVe.jpg
http://i.imgur.com/248U89A.jpg
http://i.imgur.com/4tHNdsS.jpg

My setup in short:

Motherboard: Asus Crosshair V Formula-Z
CPU: AMD FX-8350 Black Edition
GPU: Asus R9280X-DC2T-3GD5 (ATI)

I have tried to install different drivers (even beta versions) but the issue persists. I was hoping someone knew what I could do to resolve this? It starts to make playing the game unpleasant.

Thanks!