I couldn't find an answer on the GW2 forums so I thought I'd ask here if anyone had a similar problem and what they did to fix it.

Basically within 5 min of starting the game my screen will begin to flicker and black bars will appear, the game looks like it's frozen but if I tab out and tab back in the game goes back to normal. Usually it happens again within a few minutes.

Drivers are up to date; it's an nvidia card geforce gt650m. Temperature seems fine. It can run other games without issues. I haven't had any other problems with my pc crashing just Guild Wars 2.